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