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. Author manuscript; available in PMC: 2018 Aug 1.
Published in final edited form as: J Pediatr. 2017 Jun 23;187:247–252.e1. doi: 10.1016/j.jpeds.2017.05.014

Table 2.

Selected coefficients and confidence intervals from linear regression models of sleep duration and log-transformed telomere length (N=1,567)

(1) Unadjusted (2) Age-adjusted (3) All covariates

Hours of sleep 0.026** (0.011, 0.042) 0.022** (0.007, 0.037) 0.015* (0.002, 0.029)
Child’s age in months
Mother’s age at child’s birth
Father’s age at child’s birth
Child and family characteristicsb
City in which the child was born

R2 0.008 0.020 0.141
a

+p<0.10; *p<0.05; **p<0.01; ***p<0.001

b

These analyses account for the child’s age in months at age 9, whether the child was low birth weight (< 2,500 grams), child’s sex, child’s pubertal progression score, child’s BMI, whether the child was ever diagnosed with ADHD/ADD, whether the child was ever diagnosed with autism, mother’s logged telomere length, mother’s race/ethnicity, mother’s nativity, mother’s educational attainment at the child’s birth, logged maternal household income at the child’s birth, whether biological parents were married or cohabiting at the child’s birth, and the number of children in the home at the child’s birth.