Table 1.
Sociodemographic and reproductive characteristics and infant outcomes in the study population, Lima, Peru, 2009–2010
| Characteristics | Preterm birth
|
P-value# | |||
|---|---|---|---|---|---|
| Controls (n=480)
|
Cases (n=479)
|
||||
| n | % | n | % | ||
| Maternal age at delivery (years)* | 28.3±6.52 | 8.2± 6.6 | 0.74 | ||
| Maternal age at delivery (years) | 0.49 | ||||
| <20 | 42 | 8.8 | 49 | 10.2 | |
| 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 or lower | 335 | 68.9 | 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 vitamins | 68 | 14.2 | 119 | 24.8 | <0.001 |
| Any smoking during pregnancy | 0.144 | ||||
| No | 426 | 88.8 | 410 | 85.6 | |
| Yes | 54 | 11.3 | 69 | 14.4 | |
| Alcohol use during pregnancy | 157 | 32.7 | 150 | 31.3 | 0.64 |
| Prepregnancy weight (kg) | 58.0±9.8 | 56.7±10.0 | <0.001 | ||
| Infant birth weight (g) | 3392±462 | 1999±663 | 0.04 | ||
| Low birth weight infant (<2,500 g) | 14 | 2.9 | 381 | 76.5 | <0.001 |
Note:
*
Mean ± standard deviation.
#
Student’s t-test.