Table 4. Associations between sleep duration across childhood and Obesity at age 15. N=1,899.
| Minimally adjusted a | Confounder adjusted b | Confounder adjusted with additional adjustment for SDB cluster c |
|
|---|---|---|---|
| OR (95% CI)d | OR (95% CI)d | OR (95% CI)d | |
| Sleep duration at 18 months d,e | |||
| Short | 1.48 (1.00 to 2.17) P=0.05 |
1.22 (0.80 to 1.84) P=0.35 |
1.23 (0.81 to 1.86) P=0.34 |
| Average | 1 (ref) | 1 (ref) | 1 (ref) |
| Long | 1.16 (0.75 to 1.80) P=0.50 |
1.05 (0.65 to 1.68) P=0.85 |
1.05 (0.65 to 1.69) P=0.85 |
| Sleep duration at 2.5 years d,e | |||
| Short | 1.44 (0.98 to 2.10) P=0.06 |
1.38 (0.92 to 2.08) P=0.12 |
1.33 (0.89 to 2.01) P=0.17 |
| Average | 1 (ref) | 1 (ref) | 1 (ref) |
| Long | 0.50 (0.26 to 0.97) P=0.04 |
0.53 (0.26 to 1.05) P=0.07 |
0.53 (0.27 to 1.06) P=0.07 |
| Sleep duration at 4.75 years d,e | |||
| Short | 2.21 (1.52 to 3.20) P<0.001 |
1.99 (1.34 to 2.96) P=0.001 |
2.04 (1.36 to 3.04) P=0.001 |
| Average | 1 (ref) | 1 (ref) | 1 (ref) |
| Long | 1.08 (0.64 to 1.84) P=0.77 |
0.82 (0.46 to 1.47) P=0.51 |
0.86 (0.48 to 1.55) P=0.62 |
| Sleep duration at 5.75 years d,e | |||
| Short | 1.54 (1.08 to 2.20) P=0.02 |
1.62 (1.10 to 2.37) P=0.01 |
1.64 (1.11 to 2.41) P=0.01 |
| Average | 1 (ref) | 1 (ref) | 1 (ref) |
| Long | 0.83 (0.55 to 1.25) P=0.38 |
0.72 (0.46 to 1.12) P=0.14 |
0.73 (0.47 to 1.13) P=0.16 |
| Sleep duration at 6.75 years d,e | |||
| Short | 1.50 (1.00 to 2.25) P=0.05 |
1.34 (0.87 to 2.06) P=0.19 |
1.33 (0.86 to 2.06) P=0.20 |
| Average | 1 (ref) | 1 (ref) | 1 (ref) |
| Long | 0.94 (0.58 to 1.54) P=0.81 |
0.81 (0.48 to 1.37) P=0.43 |
0.82 (0.48 to 1.39) P=0.46 |
Analyses are adjusted only for child’s sex and age at BMI assessment
Analyses are adjusted for child’s sex, age at BMI/height assessment and birth weight, child’s estimated weight and height at 6 months, maternal education, age, parity and pre-pregnancy BMI, and tonsil/adenoidectomy.
Analyses are adjusted for the same variables as above, with the addition of SDB clusters
Odds ratios (95% confidence intervals) for Obesity compared with normal weight at age 15 years - compare short and long sleep duration with average sleep duration. Obesity is defined as BMI greater than the 95% percentile for age and sex, according to the International Obesity Task Force
At 18 months and 2.5 years, short sleep duration is ≤10 hours; average sleep duration is >10 and <12.5 hours, long sleep duration is ≥12.5 hours. At 4.75 years, short sleep duration is ≤10.5 hours; average sleep duration is >10.5 and <12.08 hours, long sleep duration is ≥12.08 hours. At 5.75 years, short sleep duration is ≤10.5 hours; average sleep duration is >10.5 and <12.0 hours, long sleep duration is ≥12.0 hours. At 6.75 years, short sleep duration is ≤9.5 hours; average sleep duration is >9.5 and <11.75 hours, long sleep duration is >≥11.75 hours.