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Table 3 Relationship between maternal self-reported hours of nightly sleep duration and plasma leptin concentrations in early pregnancy: estimates linear regression coefficients for the participants of the Omega Study, Seattle and Tacoma, Washington, 1996-2000

From: Sleep duration and plasma leptin concentrations in early pregnancy among lean and overweight/obese women: a cross sectional study

Hours of sleep during pregnancy N MODEL 1 MODEL 2
   β SE (β) 95% CI P-value β SE (β) 95% CI P-value
All women          
≤5 28 4.38 3.76 (−2.99, 11.76) 0.24 4.77 2.88 (−0.89, 10.43) 0.10
6 44 −0.05 2.56 (−5.08, 4.98) 0.99 1.85 2.07 (−2.21, 5.91) 0.37
7-8 485 Reference     Reference    
≥9 273 2.60 1.30 (0.04, 5.16) 0.05 1.77 1.05 (−0.30, 3.83) 0.09
Adjusted R2   0.02     0.34    
Lean women          
≤5 23 1.24 2.85 (−4.35,6.83) 0.66 1.81 2.84 (−3.76, 7.38) 0.52
6 34 −0.58 2.36 (−5.23, 4.06) 0.81 1.47 2.26 (−2.96, 5.91) 0.51
7-8 379 Reference     Reference    
≥9 205 1.10 1.18 (−1.22, 3.42) 0.35 0.86 1.09 (−1.28, 3.00) 0.43
Adjusted R2   0.02     0.15    
Overweight/obese women          
≤5 5 24.99 4.06 (16.97, 33.01) <0.001 21.96 5.30 (11.50, 32.43) <0.001
6 10 1.40 5.47 (−9.39, 12.20) 0.80 3.95 4.86 (−5.63, 13.53) 0.42
7-8 106 Reference     Reference    
≥9 68 4.61 2.88 (−1.07, 10.30) 0.11 4.29 2.62 (−0.87, 9.46) 0.09
Adjusted R2   0.07     0.25    
  1. Separate models were fit for all, lean (BMI <25 kg/m2), and overweight BMI ≥25 kg/m2) women, respectively.
  2. Model 1: reported coefficients adjusted for maternal age, race/ethnicity, and marital status; and Model 2: Model 1 + maternal pre-pregnancy body mass index.
  3. β, Estimated coefficient; SE (β), Standard error of the estimated coefficient; 95% CI, 95% confidence interval.