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Much adult physical inactivity research ignores early-life factors from which later influences may originate. In the 1958 British birth cohort (followed from 1958 to 2008), leisure-time inactivity, defined as activity frequency of less than once a week, was assessed at ages 33, 42, and 50 years (n = 12,776). Early-life factors (at ages 0–16 years) were categorized into 3 domains (i.e., physical, social, and behavioral). We assessed associations of adult inactivity 1) with factors within domains, 2) with the 3 domains combined, and 3) allowing for adult factors. At each age, approximately 32% of subjects were inactive. When domains were combined, factors associated with inactivity (e.g., at age 50 years) were prepubertal stature (5% lower odds per 1–standard deviation higher height), hand control/coordination problems (14% higher odds per 1-point increase on a 4-point scale), cognition (10% lower odds per 1–standard deviation greater ability), parental divorce (21% higher odds), institutional care (29% higher odds), parental social class at child's birth (9% higher odds per 1-point reduction on a 4-point scale), minimal parental education (13% higher odds), household amenities (2% higher odds per increase (representing poorer amenities) on a 19-point scale), inactivity (8% higher odds per 1-point reduction in activity on a 4-point scale), low sports aptitude (13% higher odds), and externalizing behaviors (i.e., conduct problems) (5% higher odds per 1–standard deviation higher score). Adjustment for adult covariates weakened associations slightly. Factors from early life were associated with adult leisure-time inactivity, allowing for early identification of groups vulnerable to inactivity. [ABSTRACT FROM PUBLISHER]

Children born after an unplanned pregnancy have poorer developmental scores. This could arise from less favorable parenting but also could reflect confounding from the socioeconomic circumstances. In a large representative sample in the United Kingdom, the Millennium Cohort Study (2001-2005), cognitive delay at 3 years was explored with the Bracken Assessment. Its association with unplanned pregnancy was studied in logistic models controlling for demographic and socioeconomic characteristics of the family, the child's characteristics, and parenting behavior. Stratification by the mother's educational level (grouped into 3 categories) was explored. Of 12,182 children included in the analysis, 41% were born after a pregnancy reported by the mother to have been a "surprise." Such unplanned pregnancies were associated in univariate analysis with more cognitive delay. Among mothers with a low or middle level of education, this association vanished when socioeconomic circumstances were controlled. Among mothers with a high level of education, the risk of cognitive delay remained significantly and unexplainedly raised after unplanned pregnancies, despite controlling for socioeconomic characteristics and parental behavior. In conclusion, for socially disadvantaged children, having resulted from an unplanned pregnancy does not seem to increase their already disproportionate risk of cognitive delay. Births after unplanned conceptions are mainly a symptom rather than a source of disadvantage. [ABSTRACT FROM AUTHOR]

Although there is increasing evidence that immune dysregulation in children who develop acute lymphoblastic leukemia (ALL) is detectable from birth, debate about the role of infectious exposures in infancy continues. With the aim of quantifying children's infectious exposures, investigators have used a number of infection exposure proxies, but there is a lack of consistency in findings, with some markers indicating increased ALL risks and others decreased risks, the disparity being evident both within and between studies. Accordingly, the authors conducted an in-depth analysis of key infection exposure proxies used in the United Kingdom Childhood Cancer Study, a national population-based case-control study conducted over the period 1991–1996, which combined data from medical records, parental interview, and population census. This longitudinal approach revealed the marked deterioration in immune response that emerged around 5 months prior to ALL diagnosis and confirmed that infectious diagnoses in the first year of life were significantly increased (P < 0.05) in children who developed leukemia between 2 and 14 years of age, as well as in those who had birth orders >1, were not breastfed, lived in deprived areas, or were diagnosed with eczema. By contrast, no association between infectious illness and preschool activity was detected, the lower infection levels among controls whose mothers reported attendance contributing to a significantly reduced ALL odds ratio. [ABSTRACT FROM PUBLISHER]