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 |