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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.