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Table 5 Odds Ratio (OR) and 95% Confidence Interval (CI) of spontaneous preterm birth for joint categories of maternal sleep duration and complaints of 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) All spontaneous preterm birth (N = 479) Unadjusted OR Adjusted OR*
Night hours of sleep & exhaustion n % n % OR (95% CI) OR (95% CI)
7-8 hours & no exhaustion 117 24.4 57 11.9 1.00 Referent 1.00 Referent
≤ 6 hours & no exhaustion 27 5.6 16 3.3 1.22 (0.61-2.44) 1.30 (0.64-2.63)
≥ 9 hours & no exhaustion 41 8.5 26 5.4 1.30 (0.73-2.34) 1.22 (0.67-2.22)
7-8 hours & any exhaustion 208 43.3 227 47.4 2.24 (1.55-3.24) 2.22 (1.52-3.23)
≤ 6 hours & any exhaustion 52 10.8 91 19.0 3.59 (2.26-5.72) 3.58 (2.21-5.78)
≥ 9 hours & any exhaustion 35 7.3 62 12.9 3.64 (2.16-6.13) 3.74 (2.20-6.35)
Interaction p-value (short sleep & any exhaustion) 0.50   0.60  
Interaction p-value (long sleep & any exhaustion) 0.56   0.40  
  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.