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Table 4 Odds Ratio (OR) and 95% Confidence Interval (CI) of spontaneous preterm birth severity according to maternal sleep duration and vital exhaustion during the first six months of pregnancy, Lima, Peru, 2009-2010

From: Sleep duration, vital exhaustion, and odds of spontaneous preterm birth: a case–control study

 

Term controls (N = 480)

Very preterm < 32 weeks (N = 135)

Moderate preterm 32–33 weeks (N = 78)

Late preterm 34- < 37 weeks (N = 266)

Exposure parameters

n

n

OR* (95% CI)

n

OR* (95% CI)

n

OR* (95% CI)

Hours of sleep per night

       

 ≤ 6 hours

79

25

1.25 (0.74-2.11)

18

1.82 (0.98-3.37)

64

1.64 (1.11-2.43)

 7-8 hours

325

82

1.00 (referent)

41

1.00 (referent)

161

1.00 (referent)

 ≥ 9 hours

76

28

1.48 (0.89-2.47)

19

1.98 (1.08-3.65)

41

1.10 (0.72-1.70)

Complaint of vital exhaustion

       

 Never

185

28

1.00 (referent)

19

1.00 (referent)

52

1.00 (referent)

 Ever

295

107

2.40 (1.51-3.82)

59

1.96 (1.13-3.41)

214

2.58 (1.80-3.69)

   1-3 times/Month

204

66

2.22 (1.36-3.63)

34

1.65 (0.91-3.00)

101

1.81 (1.22-2.69)

   4 times/Month - Weekly

73

36

3.07 (1.73-5.45)

20

2.68 (1.34-5.35)

100

4.70 (3.03-7.30)

   Daily

18

5

1.90 (0.64-5.60)

5

2.74 (0.90-8.31)

13

2.59 (1.18-5.72)

P-value for trend

  

<0.001

 

0.004

 

<0.001

  1. *Adjusted for maternal age, pre-pregnancy weight, unplanned pregnancy, no vitamin use during pregnancy.
  2. Bolded estimates are statistically significant at the α = 0.05 level.