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Table 3 Odds Ratio (OR) and 95% Confidence Interval (CI) of spontaneous preterm birth sub-types 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)

Spontaneous Preterm Labor (SPTL) (N = 245)

Preterm Premature Rupture of Membrane (PPROM) (N = 234)

Exposure parameters

n

n

OR* (95% CI)

n

OR* (95% CI)

Hours of sleep per night

     

  ≤ 6 hours

79

51

1.51 (1.00-2.29)

56

1.60 (1.06-2.40)

  7-8 hours

325

143

1.00 (referent)

141

1.00 (referent)

  ≥ 9 hours

76

51

1.50 (0.99-2.27)

37

1.17 (0.74-1.83)

Complaint of vital exhaustion

     

  Never

185

55

1.00 (referent)

44

1.00 (referent)

  Ever

295

190

2.21 (1.54-3.15)

190

2.66 (1.81-3.89

   1-3 times/Month

204

106

1.81 (1.23-2.67)

95

2.00 (1.32-3.02)

   4 times/Month - Weekly

73

73

3.34 (2.13-5.24)

83

4.47 (2.81-7.10)

   Daily

18

11

2.17 (0.95-4.93)

12

2.73 (1.21-6.16)

P-value for trend

  

<0.001

 

<0.001

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