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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.