14 results on '"Joel E. Milam"'
Search Results
2. Prevalence and correlates of skin examination among ethnically diverse young adult survivors of childhood cancer
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Kimberly A. Miller, Angela A. Li, Katherine Y. Wojcik, Julia Stal, Myles G. Cockburn, Gino K. In, David R. Freyer, Ann S. Hamilton, and Joel E. Milam
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follow‐up care ,secondary prevention ,skin cancer ,survivors of childhood cancer ,Neoplasms. Tumors. Oncology. Including cancer and carcinogens ,RC254-282 - Abstract
Abstract Background Skin cancer is the most common secondary malignancy among young adult childhood cancer survivors (YA‐CCS). Skin examination to detect skin cancer early (including melanoma as well as basal or squamous cell skin cancers), both physician‐based (PSE) and self‐skin exam (SSE), is recommended, particularly for radiotherapy‐exposed YA‐CCS who are at high risk of developing skin cancer. Methods Awareness and prevalence of skin examination and demographic, clinical, and healthcare correlates were examined in a population‐based sample of YA‐CCS with diverse cancer types excluding melanoma. Descriptive frequencies and logistic regression models were conducted using sample weights to correct for non‐response bias with PSE, SSE and adherence to both as outcomes. Results The sample comprised 1064 participants with 53% Latino. Eight percent of participants were aware of the need for skin examination; 9% reported receipt of PSE within past 2 years; 35% reported regular SSE; and 6% were adherent to both. Among the radiotherapy‐treated, 10% were aware of the need for skin examination, 10% reported recent PSE; 38% reported regular SSE; and 8% were adherent to both. Healthcare and clinical factors including healthcare self‐efficacy, engagement in cancer‐related follow‐up care, greater treatment intensity and greater number of treatment‐related late effects were positively associated with PSE and SSE. Latino YA‐CCS were less likely to engage in PSE and SSE. Conclusion(s) Adherence to recommended screening for skin cancer was low in this at‐risk population, notably for YA‐CCS exposed to radiotherapy. The development of effective strategies to expand skin cancer screening is needed in this at‐risk population.
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- 2023
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3. Social networks of oncology clinicians as a means for increasing survivorship clinic referral
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Sarah E. Piombo, Kimberly A. Miller, David R. Freyer, Joel E. Milam, Anamara Ritt-Olson, Gino K. In, and Thomas W. Valente
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Medicine - Abstract
Piombo et al. analyse social networks of cancer clinicians to study referral practices to a cancer survivorship clinic at a comprehensive cancer centre. The authors identify key opinion leaders within the networks and suggest interventions to improve referrals to survivorship services.
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- 2022
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4. Prevalence and correlates of skin examination among ethnically diverse young adult survivors of childhood cancer
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Kimberly A. Miller, Angela A. Li, Katherine Y. Wojcik, Julia Stal, Myles G. Cockburn, Gino K. In, David R. Freyer, Ann S. Hamilton, and Joel E. Milam
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Cancer Research ,Oncology ,Radiology, Nuclear Medicine and imaging - Abstract
Skin cancer is the most common secondary malignancy among young adult childhood cancer survivors (YA-CCS). Skin examination to detect skin cancer early (including melanoma as well as basal or squamous cell skin cancers), both physician-based (PSE) and self-skin exam (SSE), is recommended, particularly for radiotherapy-exposed YA-CCS who are at high risk of developing skin cancer.Awareness and prevalence of skin examination and demographic, clinical, and healthcare correlates were examined in a population-based sample of YA-CCS with diverse cancer types excluding melanoma. Descriptive frequencies and logistic regression models were conducted using sample weights to correct for non-response bias with PSE, SSE and adherence to both as outcomes.The sample comprised 1064 participants with 53% Latino. Eight percent of participants were aware of the need for skin examination; 9% reported receipt of PSE within past 2 years; 35% reported regular SSE; and 6% were adherent to both. Among the radiotherapy-treated, 10% were aware of the need for skin examination, 10% reported recent PSE; 38% reported regular SSE; and 8% were adherent to both. Healthcare and clinical factors including healthcare self-efficacy, engagement in cancer-related follow-up care, greater treatment intensity and greater number of treatment-related late effects were positively associated with PSE and SSE. Latino YA-CCS were less likely to engage in PSE and SSE.Adherence to recommended screening for skin cancer was low in this at-risk population, notably for YA-CCS exposed to radiotherapy. The development of effective strategies to expand skin cancer screening is needed in this at-risk population.
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- 2022
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5. Hispanic/Latinos and non-Hispanic whites’ childhood cancer survivors and parents: a dyadic analysis of coping resources and mental health
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Carol Y. Ochoa, Junhan Cho, Kimberly A. Miller, Lourdes Baezconde-Garbanati, Randall Y. Chan, Albert J. Farias, and Joel E. Milam
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Oncology ,Oncology (nursing) - Abstract
Purpose While limited, dyadic research demonstrates the interdependent relationship between the health and adjustment after treatment between cancer survivors and caregivers. We examined interrelationships between coping resources and mental health among childhood cancer survivors (CCS)–parent dyads. Methods One hundred sixty CCS-parent dyads from the Project Forward pilot study completed validated questions assessing social support, religiosity, spirituality, depressive symptoms, and perceived stress. Bidirectional associations were identified with path analysis utilizing the actor-partner interdependence model (APIM). We used a multigroup approach to test for the moderating effects by Hispanic ethnicity on these relationships. Results Mean age of CCS was 20 years old, 51% female, 30% diagnosed with leukemia, and mean of 7 years from diagnosis. The mean age of parents was 49 years old and 89% were mothers. For both CCS and parents, perceived social support was inversely associated with their depressive symptoms and perceived stress (e.g., actor effects). Parents’ social support was not significantly associated with CCS’s depressive symptoms and stress. However, higher perceived social support by the CCS was inversely associated with parents’ depressive symptoms (β = − 0.202, p β = − 0.164, p Conclusion Partner effects of social support among CCS-parent dyads may influence psychological distress. Implication for Cancer Survivors Our findings on parent–child associations between social support and psychosocial well-being imply that survivorship care can be enhanced when the social support needs of both survivors and their parents are addressed together.
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- 2023
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6. Examining the Factor Structure of an Adapted Posttraumatic Growth Inventory in a Sample of Childhood Cancer Survivors: A Brief Report
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Julia Stal, Cynthia N. Ramirez, Jimi Huh, Jessica Tobin, Yoonji Kim, Kimberly A. Miller, and Joel E. Milam
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Health Policy - Abstract
Posttraumatic growth (PTG) represents positive changes following a trauma, crisis, and/or psychologically distressing event. Experiencing cancer can serve as a traumatic event for patients, resulting in life changes among survivors. Various PTG measures have been used to assess post-cancer change among childhood cancer survivors (CCS), but few have been evaluated for use in this population. This study examined the factor structure of an adapted, 11-item version of the Posttraumatic Growth Inventory (PTGI) among CCS. A randomly selected subgroup of participants ( N = 332) was selected from the Los Angeles Cancer Surveillance Program (mean age of 26.5 years at time of survey, mean age at diagnosis of 12 years, primarily male [53.6%], and Hispanic [51.5%]). Participants indicated the degree to which they experienced positive, negative, or no change in their life because of their cancer experience. An exploratory factor analysis (EFA) identified two factors: Appreciation of New Possibilities and Spiritual Change. The adapted, 11-item PTGI was deemed appropriate for use among CCS. Additional research is needed to confirm the use of the two-factor model with confirmatory factor analysis in an independent sample. Future research on PTG among CCS can consider spiritual change as a potential independent factor.
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- 2022
7. The Impact of Hispanic Ethnicity and Language on Communication Among Young Adult Childhood Cancer Survivors, Parents, and Medical Providers and Cancer-Related Follow-Up Care
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Carol Y. Ochoa, Junhan Cho, Kimberly A. Miller, Lourdes Baezconde-Garbanati, Randall Y. Chan, Albert J. Farias, and Joel E. Milam
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Adult ,Male ,Parents ,Oncology (nursing) ,Health Policy ,Communication ,Aftercare ,Hispanic or Latino ,Young Adult ,Special Series: Disparities in Cancer Care for Hispanic-Latinx People ,Oncology ,Cancer Survivors ,Neoplasms ,Ethnicity ,Humans ,Female ,Child ,Language - Abstract
PURPOSE:The triad of communication between young adult childhood cancer survivors (YACCSs), their parents, and their medical providers is an important process in managing health care engagement. This study sought to identify communication patterns among this triad, factors associated with communication, and engagement of survivorship care.METHODS:We analyzed data from Project Forward, a population-based study that surveyed YACCSs and their parents. YACCSs were on average age 20 years, 7 years from diagnosis, 50% female, and 57% identified as Hispanic/Latino (N = 160 dyads). Latent class analysis of nine communication indicators from parent and YACCS surveys identified distinct classes of communication between YACCSs, parents, and medical providers. Associations between resulting classes and YACCS/parent characteristics were examined using multinomial logistic regression. Logistic regression was used to examine the association between communication classes and cancer-related follow-up care.RESULTS:Latent class analysis identified three classes of triad communication: (1) high health care–focused communication (37.5%), (2) high comprehensive communication (15.6%), and (3) overall low communication (46.9%). After adjusting for covariates, greater time since diagnosis was associated with reduced odds of membership in class 2 while dyads with Spanish-speaking Hispanic parents were more likely to be in class 2 ( v class 3). Additionally, YACCSs who were in either of the high communication groups were more likely to have received recent follow-up care.CONCLUSION:Examining language preference provides an important contextual understanding as we found Spanish-speaking Hispanic parents engaged in high communication, which was associated with cancer-related follow-up care. Yet, our results also support the need to enhance communication between this triad to improve outcomes.
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- 2022
8. Barriers and facilitators of Hispanic/Latino parents caregiving for a childhood cancer survivor: a qualitative study
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Carol Y. Ochoa, Randall Y. Chan, Lissette Cervantes, Lourdes Baezconde-Garbanati, Albert J. Farias, Joel E. Milam, Junhan Cho, and Kimberly A. Miller
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Cancer Research ,Oncology - Abstract
This qualitative study aimed to explore Hispanic parents of childhood cancer survivors (CCS) perceptions of facilitators and barriers to their caregiving experience.We conducted semi-structured phone interviews with 15 Hispanic/Latino parents (English and Spanish). Parents were recruited using a purposive sampling method in a safety-net hospital in Los Angeles County from July-September 2020. Interviews were audio-recorded, professionally transcribed, and analyzed in the language they were conducted. Two coders independently coded interviews following reflexive thematic analysis and elements of grounded theory methodology.Most caregivers were mothers caring for leukemia CCS who had finished treatment more than 2 years prior. Caregivers expressed gratitude to social workers for introducing and aiding with the application process for safety-net programs that enabled caregivers to focus on their child's care and well-being. Caregivers revealed the importance of supportive communication with the medical team, particularly after their child's treatment was considered complete. All caregivers found caring for a child with cancer overwhelming, and many described deteriorations in their health and well-being. Financial instability, transportation difficulties, and work disruptions were identified as barriers, resulting in caregiver distress. Caregivers also shared the challenges they experienced navigating the healthcare system, seeking care despite lack of legal residency, and staying afloat despite limited employment opportunities.Improving navigation to resources and improving relationships with the medical team may reduce the perceived caregiving burden among Hispanic/Latino caregivers throughout their family's cancer journey.
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- 2022
9. Patient Care Satisfaction and Emergency Room Utilization among Young Adult Colorectal Cancer Survivors during the SARS-CoV-2 Pandemic: Lessons Learned
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Dalia Kagramanov, Kimberly A. Miller, Phuong Gallagher, David R. Freyer, Joel E. Milam, Heinz-Josef Lenz, and Afsaneh Barzi
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General Medicine ,colorectal cancer survivor ,emergency utilization ,SARS-CoV-2 ,care satisfaction ,pandemic - Abstract
Introduction: Survivors of colorectal cancer (CRC) are at risk for late effects of therapy and recurrence of cancer. With recurrence rates ranging between 30–40%, follow-up care is needed for both early detection and management of late effects. Cancer care delivery for CRC patients was significantly disrupted by the SARS-CoV-2 pandemic, with decreases of 40% in such services in the United States between April 2020 and 2019. Survivors were left with fewer options for care, potentially causing increases in emergency room (ER) utilization. Methods: This cross-sectional study examined the patterns of ER utilization during the SARS-CoV-2 pandemic among young adult CRC survivors and assessed the relationship between self-reported care satisfaction and ER use. Eligible participants were colon or rectal cancer survivors diagnosed between 18–39 years of age, 6–36 months from diagnosis/relapse, English speaking and residing in the United States. Multivariable logistic regression assessed the association between patient care satisfaction and ER utilization, adjusting for pandemic factors. Covariates were chosen by significance of p < 0.1 at the univariate level and perceived clinical significance. Results: The overall sample (N = 196) had mean age (SD) 32.1 (4.5); 59% were male. Tumor location was colon or rectal in 42% and 57%, respectively, and the majority (56%) were diagnosed with stage 2 disease; 42.6% reported relapsed disease, and 20% had an ostomy. Most survivors (72.5%) had between 1–4 visits to an ER in the last 12 months and were categorized as normal utilizers. Approximately 24.7% of the sample had greater than 4 visits to the ER in the last 12 months and were categorized as super-utilizers. CRC survivors that reported a delay in their follow-up care as a result of the pandemic were two times (OR: 2.05, 95% CI 0.99, 4.24) more likely to be super-utilizers of the ER. Higher self-reported satisfaction with care was associated with a 13.7% lower likelihood of being a super-utilizer (OR: 0.86, 95%CI: −0.68, 1.09). Conclusions: This study found strong associations between delays in care, self-reported care satisfaction, and being a super-utilizer of the ER during the pandemic among young adult CRC survivors off treatment. Increasing patient satisfaction and minimizing care interruptions amongst this vulnerable population may aid in mitigating over-utilization in the ER during an ongoing pandemic.
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- 2023
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10. Fertility Preservation Discussions Between Young Adult Rectal Cancer Survivors and Their Providers: Sex-Specific Prevalence and Correlates
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Julia Stal, Serena Y Yi, Sally Cohen-Cutler, Phuong Gallagher, Afsaneh Barzi, David R Freyer, Joel E Milam, Heinz-Josef Lenz, and Kimberly A Miller
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Male ,Cancer Research ,Rectal Neoplasms ,Fertility Preservation ,Young Adult ,Cross-Sectional Studies ,Rare Diseases ,Oncology ,Cancer Survivors ,Semen ,Child, Preschool ,Neoplasms ,Prevalence ,Quality of Life ,Humans ,Female ,Survivors ,Neoplasm Recurrence, Local - Abstract
Background Young adults (YA) diagnosed with rectal cancer are disproportionately impacted by the gonadotoxic effects of treatment and potential subsequent infertility. Objective The purpose of this study was to characterize the prevalence of fertility preservation measures used, reasons why such measures were not used, and correlates of discussion between providers and YA rectal cancer survivors. Design An online, cross-sectional survey was administered on the Facebook page of a national colorectal cancer (CRC) advocacy organization. Eligible participants were rectal cancer survivors diagnosed before age 50, between 6 and 36 months from diagnosis or relapse, and based in the US. Results Participants were 148 rectal cancer survivors. Over half of the survivors reported that their doctor did not talk to them about potential therapy-related fertility complications. Only one-fifth of survivors banked sperm (males) or eggs/embryos (females) prior to their cancer therapy. Older age at diagnosis and greater quality of life were significantly associated with a higher likelihood of fertility discussions among males. Greater quality of life was significantly associated with a higher likelihood of fertility discussion among females. Conclusions These findings indicate that the majority of YA rectal cancer survivors do not receive, or cannot recall, comprehensive cancer care, and help to identify patients with rectal cancer who may be at risk for inadequate fertility counseling. Clinicians should provide proper counseling to mitigate this late effect and to ensure optimal quality of life for YA rectal cancer survivors.
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- 2021
11. Abstract PO-016: A latent class analysis of communication patterns between Hispanic and non-Hispanic childhood cancer survivors, parents, and medical providers
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Carol Y. Ochoa, Junhan Cho, Kimberly A. Miller, Lourdes Baezconde-Garbanati, Randall Y. Chan, Albert J. Farias, and Joel E. Milam
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Oncology ,Epidemiology - Abstract
Introduction: The triad of communication between childhood cancer survivors (CCS), their parents, and their medical providers may motivate CCS healthcare engagement but has not been examined. This may be particularly important for Hispanic/Latino populations, who are more likely to trust and receive health information from hospital providers and are less likely to remain engaged in survivorship care compared to non-Hispanic white persons. Methods: We analyzed data from the Project Forward pilot study, a population-based study that evaluated follow-up care among 160 CCS-parent dyads (CCS mean age=20 years, 7 years from diagnosis, and 29% of parents identified as Spanish-speaking Hispanic). Nine indicators representing multiple dimensions of communication were used in latent class analysis to identify distinct classes of communication. These indicators were selected from the parent and CCS survey and asked about communication between CCS, parents, and medical providers. The association between resulting classes and various covariates (e.g., parent ethnicity/language, CCS demographic, clinical characteristics) was examined using multinomial logistic regression. Results: Three classes of the triad of communication were identified: (1) high healthcare-focused communication (37.5%); (2) high comprehensive communication (15.6%); and (3) overall low communication (46.9%). The high healthcare-focused communication class was characterized by patterns of high probability for communication about future health care needs among CCS, parents, and medical providers. The high comprehensive communication class was characterized by a high probability of communication about future healthcare needs and a high probability for parent-CCS communication about different cancer facets. The overall low communication class was characterized by a low probability of endorsing any communication items. Greater time since diagnosis was marginally significantly associated with reduced odds of the dyad's membership in class 2 [OR=0.798, 95% CI=0.635, 1.002, p-value=0.0520], compared to class 3 (low communication). Additionally, dyads with English-speaking non-Hispanic parents were less likely to be in class 2 [OR=0.361, 95% CI=0.130, 1.005, p-value=0.0511], compared to class 3. After adjusting for all covariates simultaneously, greater time since diagnosis was associated with reduced odds of membership in class 2 (vs class 3). Dyads with Spanish-speaking Hispanic parents were more likely to be in classes 1 and 2 (vs. class 3). Discussion: Our results support the need to enhance communication among CCS, parents, and medical providers generally to improve knowledge and understanding about the long-term effects of cancer, treatment, and outcomes. Our study suggests that dyads, where parents were Spanish-speaking Hispanics tended to engage in high communication. Examining language preference provides an important contextual understanding as it supports the notion that Hispanic/Latino cultural values may play a favorable role in high levels of communication. Citation Format: Carol Y. Ochoa, Junhan Cho, Kimberly A. Miller, Lourdes Baezconde-Garbanati, Randall Y. Chan, Albert J. Farias, Joel E. Milam. A latent class analysis of communication patterns between Hispanic and non-Hispanic childhood cancer survivors, parents, and medical providers [abstract]. In: Proceedings of the AACR Virtual Conference: 14th AACR Conference on the Science of Cancer Health Disparities in Racial/Ethnic Minorities and the Medically Underserved; 2021 Oct 6-8. Philadelphia (PA): AACR; Cancer Epidemiol Biomarkers Prev 2022;31(1 Suppl):Abstract nr PO-016.
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- 2022
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12. Cancer-related follow-up care among Hispanic and non-Hispanic childhood cancer survivors: The Project Forward study
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Joel E, Milam, Kathleen, Meeske, Rhona I, Slaughter, Sandra, Sherman-Bien, Anamara, Ritt-Olson, Aura, Kuperberg, David R, Freyer, and Ann S, Hamilton
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Adult ,Male ,Insurance, Health ,Adolescent ,Depression ,Hispanic or Latino ,Insurance Coverage ,Self Efficacy ,White People ,Article ,Young Adult ,Logistic Models ,Personality Development ,Neoplasms ,Humans ,Female ,Self Report ,Survivors ,Child ,Follow-Up Studies - Abstract
Follow-up care is critical for childhood cancer survivors (CCS), who are at high risk for comorbidities and late effects of cancer treatments. Understanding the factors associated with maintaining follow-up care is needed, especially for Hispanic CCS, who have been under-represented in previous studies.Risk factors and protective factors for receiving cancer-related follow-up care were examined among 193 Los Angeles County CCS diagnosed between 2000 and 2007 (54% Hispanic; mean ± standard deviation age, 19.9 ± 2.8 years; age at diagnosis, 12.1 ± 3.0 years; time since diagnosis, 7.8 ± 2.0 years). Self-report surveys were used to assess follow-up care, insurance status, demographics, clinical factors, and psychosocial risk (eg, depression) and protective (eg, self-efficacy [SE]) factors. Multivariable logistic regression was used to identify factors associated with the previous receipt of cancer-related follow-up care (in prior 2 years) and the intent to seek future cancer-related follow-up care.Seventy-three percent of CCS reported a cancer follow-up visit in the previous 2 years, which was positively associated (P .05) with having health insurance, white ethnicity (vs Hispanic), younger age, and greater treatment intensity. Sixty-nine percent reported an intent to receive follow-up care in the next 2 years, which was positively associated (P.05) with having health insurance and greater SE.Hispanics and older CCS were more likely to lack previous follow-up care. Because health insurance was strongly associated with both previous follow-up care and the intent to seek care, the current results indicate that recent changes in health coverage may improve follow-up among CCS. Interventions targeting improved SE may help increase intent to receive follow-up care for this population.
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- 2014
13. Post-traumatic growth among an ethnically diverse sample of adolescent and young adult cancer survivors
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T Em, Arpawong, Alyssa, Oland, Joel E, Milam, Kathleen, Ruccione, and Kathleen A, Meeske
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Male ,Adolescent ,Depression ,Hispanic or Latino ,humanities ,White People ,Article ,Stress Disorders, Post-Traumatic ,Young Adult ,Neoplasms ,Adaptation, Psychological ,Quality of Life ,Humans ,Female ,Survivors ,Child - Abstract
OBJECTIVE: Although some survivors of childhood cancer report significant psychosocial distress, many also report having derived benefits, or post-traumatic growth (PTG), from their cancer experience. This study examines PTG and its correlates among an ethnically diverse sample of adolescent/young adult (AYA) cancer survivors who have recently completed treatment. METHODS: Survivors of childhood cancer (n = 94; 47% Hispanic), ages 11–21 and within 6 months of completing cancer therapy, were recruited from three pediatric cancer centers. Participants completed a structured interview that assessed demographics, PTG, post-traumatic stress symptoms, health-related quality of life, optimism, and depressive symptoms. Diagnosis/treatment information was collected from each patient’s medical record. Multiple regression analyses were used to identify significant correlates of PTG. RESULTS: The majority of survivors reported positive growth. PTG was positively associated with psychosocial functioning and post-traumatic stress symptoms and inversely associated with physical functioning and depressive symptoms. PTG was significantly lower among survivors of bone tumors (vs. survivors of other cancers) and Hispanic survivors who primarily spoke English at home (vs. Hispanics who primarily spoke Spanish at home and non-Hispanics). PTG was not significantly related to age, sex, optimism, cancer treatment modality, duration of treatment, or treatment intensity. CONCLUSIONS: The AYA survivors commonly reported PTG in the immediate aftermath of cancer treatment. Findings regarding PTG among more acculturated Hispanic and bone tumor AYA survivors may help to inform risk-adapted clinical interventions, among those transitioning from active treatment to post-treatment surveillance, to mitigate negative long-term sequelae and enhance positive psychosocial adaptation from the cancer diagnosis and treatment.
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- 2012
14. Competing definitions of contextual environments
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Zaria, Tatalovich, John P, Wilson, Joel E, Milam, Michael L B, Jerrett, and Rob, McConnell
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Adolescent ,Social Class ,Research ,Geographic Information Systems ,Humans ,lcsh:R858-859.7 ,Longitudinal Studies ,Environment ,Child ,lcsh:Computer applications to medicine. Medical informatics ,Asthma ,California - Abstract
Background The growing interest in the effects of contextual environments on health outcomes has focused attention on the strengths and weaknesses of alternate contextual unit definitions for use in multilevel analysis. The present research examined three methods to define contextual units for a sample of children already enrolled in a respiratory health study. The Inclusive Equal Weights Method (M1) and Inclusive Sample Weighted Method (M2) defined communities using the boundaries of the census blocks that incorporated the residences of the CHS participants, except that the former estimated socio-demographic variables by averaging the census block data within each community, while the latter used weighted proportion of CHS participants per block. The Minimum Bounding Rectangle Method (M3) generated minimum bounding rectangles that included 95% of the CHS participants and produced estimates of census variables using the weighted proportion of each block within these rectangles. GIS was used to map the locations of study participants, define the boundaries of the communities where study participants reside, and compute estimates of socio-demographic variables. The sensitivity of census variable estimates to the choice of community boundaries and weights was assessed using standard tests of significance. Results The estimates of contextual variables vary significantly depending on the choice of neighborhood boundaries and weights. The choice of boundaries therefore shapes the community profile and the relationships between its components (variables). Conclusion Multilevel analysis concerned with the effects of contextual environments on health requires careful consideration of what constitutes a contextual unit for a given study sample, because the alternate definitions may have differential impact on the results. The three alternative methods used in this research all carry some subjectivity, which is embedded in the decision as to what constitutes the boundaries of the communities. The Minimum Bounding Rectangle was preferred because it focused attention on the most frequently used spaces and it controlled potential aggregation problems. There is a need to further examine the validity of different methods proposed here. Given that no method is likely to capture the full complexity of human-environment interactions, we would need baseline data describing people's daily activity patterns along with expert knowledge of the area to evaluate our neighborhood units.
- Published
- 2006
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