Table 1 Socio-demographic and reproductive characteristics and infant outcomes in the study sample, Lima, Peru, 2009-2010
From: Sleep duration, vital exhaustion, and odds of spontaneous preterm birth: a case–control study
Spontaneous preterm birth | |||||
|---|---|---|---|---|---|
Term controls (N = 480) | Cases (N = 479) | ||||
Characteristics | n | % | n | % | P-value |
Maternal age at delivery (years) | 28.3 ± 6.5 | 28.2 ± 6.6 | 0.74 | ||
<20 | 42 | 8.8 | 49 | 10.2 | 0.49 |
20-29 | 235 | 49.0 | 228 | 47.6 | |
30-34 | 94 | 19.6 | 107 | 22.3 | |
≥35 | 109 | 22.7 | 95 | 19.8 | |
Primiparity | 199 | 41.5 | 205 | 42.8 | 0.68 |
≤High school education | 335 | 69.8 | 319 | 66.6 | 0.29 |
Employed during pregnancy | 195 | 40.6 | 177 | 37.0 | 0.24 |
Planned pregnancy | 209 | 43.5 | 152 | 31.7 | <0.001 |
No Prenatal care | 19 | 4.0 | 75 | 15.7 | <0.001 |
No Prenatal vitamin | 68 | 14.2 | 119 | 24.8 | <0.001 |
Smoked during pregnancy | 1 | 0.2 | 4 | 0.8 | 0.22 |
Alcohol use during pregnancy | 157 | 32.7 | 150 | 31.3 | 0.64 |
Illicit drug use during pregnancy | 0 | 0.0 | 3 | 0.6 | --- |
Pre-pregnancy weight (kg) | 58.0 ± 9.8 | 56.7 ± 10.0 | 0.04 | ||
Infant birth weight (grams) | 3393 ± 462 | 1999 ± 663 | <0.001 | ||
Low birth weight infant (<2500grams) | 14 | 2.9 | 381 | 76.5 | <0.001 |