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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
  1. Continuous measures: Mean ± SD (SD = standard deviation).