Month of Birth, Socioeconomic Background and Development in Swedish Men

Kihlbom, Magnus; Johansson, Sven‐Erik

doi:10.1017/s002193200300628x

Cited by 28 publications

(25 citation statements)

References 42 publications

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“…We were unable to collect additional data to exclude the role of possible confounders in our results. For example, socioeconomic status has been linked with morningness (Kihlbom & Johansson, 2004). Although we collected data in the two hemispheres, the cities where the participants resided also differed in terms of latitude, and, thus, latitude, rather than photoperiod, may explain the result.…”

Section: Discussionmentioning

confidence: 96%

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Season of Birth and Morningness: Comparison Between the Northern and Southern Hemispheres

Natale

Milia

2011

Chronobiology International

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The present study explored the possible role of the photoperiod at birth on morningness by collecting data in the northern (Italy) and southern (Australia) hemispheres. To assess circadian typology, the Composite Scale of Morningness (CS) was administered to a sample of 1734 university students (977 Italian and 757 Australian; 1099 females and 635 males; age 24.79 ± 7.45 yrs [mean ± SD]). Consistent with the literature, females reported higher CS scores (morningness) than males, and Australian participants reported higher CS scores than Italian participants. Allowing for the fact the seasons are reversed between the hemispheres, the results are in line with previous studies. The authors found more evening types were born during the seasons associated with longer photoperiod (spring and summer), and more morning types were born during the seasons associated with shorter photoperiod (autumn and winter), indirectly supporting an imprinting-like phenomenon played by the photoperiod at birth.

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Section: Discussionmentioning

confidence: 96%

“…This preference seems to be derived by a combination of genetic and environmental factors (Kihlbom, 2004). Several investigations have shown season of birth could be an important proxy for environmental factors in relation to development of morningness-eveningness preference.…”

Section: Introductionmentioning

confidence: 99%

Season of Birth and Morningness: Comparison Between the Northern and Southern Hemispheres

Natale

Milia

2011

Chronobiology International

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“…Season of birth is associated with a range of mental and physical disorders. 27 It is possible that season of birth has an effect through the age at which children start school. In this study some children were measured while at primary school and some while at secondary school, where the environments may provide different opportunities for physical activity.…”

Section: Researchmentioning

confidence: 99%

Early life determinants of physical activity in 11 to 12 year olds: cohort study

Mattocks

Ness

Deere

et al. 2007

BMJ

119

117

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Objective To examine factors in early life (up to age 5 years) that are associated with objectively measured physical activity in 11-12 year olds. Design Prospective cohort study. Setting Avon longitudinal study of parents and children, United Kingdom. Participants Children aged 11-12 years from the Avon longitudinal study of parents and children. Main outcome measure Physical activity levels in counts per minute (cpm) and minutes of moderate to vigorous physical activity for seven days measured with a uniaxial actigraph accelerometer. Results Valid actigraph data, defined as at least three days of physical activity for at least 10 hours a day, were collected from 5451 children. Several factors were associated with physical activity at ages 11-12 years. Regression coefficients are compared with the baseline of "none" for categorical variables: maternal brisk walking during pregnancy (regression coefficient 5.0, 95% confidence interval −8.5 to 18.5; cpm for <1 h/wk and ≥2 h/wk of physical activity 17.7, 5.3 to 30.1), maternal swimming during pregnancy (21.5, 10.9 to 32.1 and cpm for <1 h/wk and ≥2 h/wk of physical activity 24.2, 7.8 to 40.7), parents' physical activity when the child was aged 21 months (28.5, 15.2 to 41.8 and cpm of physical activity for either parent active and both parents active 33.5, 17.8 to 49.3), and parity assessed during pregnancy (2.9, −7.6 to 13.4 and cpm of physical activity for 1 and ≥2 parity 21.2, 7.1 to 35.3). Conclusions Few factors in early life predicted later physical activity in 11-12 year olds. Parents' physical activity during pregnancy and early in the child's life showed a modest association with physical activity of the child at age 11-12 years, suggesting that active parents tend to raise active children. Helping parents to increase their physical activity therefore may promote children's activity.

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“…Certainly, some of these factors, e.g., access to vitaminrich and mineral-rich food could be compensated by importing food or dietary supplementation-given sufficient financial resources. Some studies indicate that the season of birth exerts influence on the biological condition of children only from specific social groups (Henneberg and Louw, 1990;Kihlbom and Johansson, 2004;Ko sci nski et al, 2009). Furthermore, birth seasonality is related to SES, and there are researchers who explain the effect of the month of birth on the biological condition by diverse factors in the socioeconomic, instead of natural, environment (Bobak and Gjonca, 2001).…”

Section: Discussionmentioning

confidence: 99%