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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.