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Total recall in the SCAMP cohort: Validation of self-reported mobile phone use in the smartphone era
- Source :
- Environmental Research
- Publication Year :
- 2018
- Publisher :
- Elsevier, 2018.
-
Abstract
- Mobile phone use, predominantly smartphones, is almost ubiquitous amongst both adults and children. However adults and children have different usage patterns. A major challenge with research on mobile phone use is the reliability of self-reported phone activity for accurate exposure assessment. We investigated the agreement between self-reported mobile phone use data and objective mobile operator traffic data in a subset of adolescents aged 11–12 years participating in the Study of Cognition, Adolescents and Mobile Phones (SCAMP) cohort. We examined self-reported mobile phone use, including call frequency, cumulative call time duration and text messages sent among adolescents from SCAMP and matched these data with records provided by mobile network operators (n = 350). The extent of agreement between self-reported mobile phone use and mobile operator traffic data use was evaluated using Cohen's weighted Kappa (ĸ) statistics. Sensitivity and specificity of self-reported low (< 1 call/day, ≤ 5 min of call/day or ≤ 5 text messages sent/day) and high (≥ 11 calls/day, > 30 min of call/day or ≥ 11 text messages sent /day) use were estimated. Agreement between self-reported mobile phone use and mobile operator traffic data was highest for the duration spent talking on mobile phones per day on weekdays (38.9%) and weekends (29.4%) compared to frequency of calls and number of text messages sent. Adolescents overestimated their mobile phone use during weekends compared to weekdays. Analysis of agreement showed little difference overall between the sexes and socio-economic groups. Weighted kappa between self-reported and mobile operator traffic data for call frequency during weekdays was κ = 0.12, 95% CI 0.06–0.18. Of the three modes of mobile phone use measured in the questionnaire, call frequency was the most sensitive for low mobile phone users on weekdays and weekends (77.1, 95% CI: 69.3—83.7 and 72.0, 95% CI: 65.0–78.4, respectively). Specificity was moderate to high for high users with the highest for call frequency during weekdays (98.4, 95% CI: 96.4–99.5). Despite differential agreement between adolescents’ self-reported mobile phone use and mobile operator traffic data, our findings demonstrate that self-reported usage adequately distinguishes between high and low use. The greater use of mobile smartphones over Wi-Fi networks by adolescents, as opposed to mobile phone networks, means operator data are not the gold standard for exposure assessment in this age group. This has important implications for epidemiologic research on the health effects of mobile phone use in adolescents.<br />Highlights • We assessed the validity of adolescents’ self-reported mobile phone use. • The study accounted for weekday and weekend use of mobile phones separately. • Findings show that self-reported usage distinguishes between high and low use. • We recommend a combination of self-reported use over Wi-Fi & operator traffic data. • Combined data will improve accurate exposure estimation in epidemiological studies.
- Subjects :
- Male
Computer science
05 Environmental Sciences
010501 environmental sciences
Time duration
Toxicology
Adolescents
01 natural sciences
Biochemistry
Article
psyc
03 medical and health sciences
0302 clinical medicine
Cognition
Phone
Surveys and Questionnaires
Humans
Mobile phones
030212 general & internal medicine
Epidemiologic research
Child
0105 earth and related environmental sciences
General Environmental Science
Recall
Reproducibility of Results
06 Biological Sciences
Cell Phone Use
F851 Applied Environmental Sciences
Mobile phone
SCAMP
Exposure measurement error
Cohort
Cellular network
B220 Toxicology
F850 Environmental Sciences
Female
Self Report
Smartphone
03 Chemical Sciences
Cell Phone
Demography
Subjects
Details
- Language :
- English
- ISSN :
- 10960953 and 00139351
- Volume :
- 161
- Database :
- OpenAIRE
- Journal :
- Environmental Research
- Accession number :
- edsair.doi.dedup.....8192a0e12dd5b47055b0e6835f5e55a3