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Table 2 Distribution of individual prenatal risk factors in full sample and by latent class

From: Prenatal risk factors and neonatal DNA methylation in very preterm infants

Prenatal risk factors Full sample
(N = 601)
Typical
(N = 367; 61%)
Physical risk
(N = 155; 26%)
Psychological risk
(N = 79; 13%)
χ2
Age > 35 18% 18% 18% 14% 0.89
Low SES 10% 6.5% 14% 18% 12.78**
 < HS degree 13% 12% 9.8% 26% 12.54**
Minority 58% 57% 56% 66% 2.45
No partner 25% 21% 18% 62% 65.33***
No prenatal care 2.7% 1.6% 1.9% 9.1% 14.01***
Underweight 5.0% 5.8% 0.0% 12% 15.48***
Obese 34% 26% 53% 33% 35.11***
Too much weight gained 18% 12% 34% 17% 33.93***
Hypertension 27% 3.3% 95% 3.9% 490.33***
Pre-eclampsia 21% 0.0% 79% 0.0% 442.57***
Diabetes 6.0% 5.5% 9.7% 1.3% 7.00*
STI/HIV 7.0% 5.0% 6.5% 18% 16.33***
Infection 10% 10% 9.0% 14% 1.39
Alcohol 3.2% 1.4% 2.6% 13% 27.18***
Illegal substances 4.5% 0.3% 4.5% 24% 85.30***
Tobacco 14% 8.0% 14% 44% 70.36***
Marijuana 10% 4.1% 8.4% 41% 96.07***
Depression 11% 4.9% 10% 39% 79.51***
Anxiety 12% 7.4% 9.7% 35% 50.62***
Pregnancy “Hard Time” 11% 6.7% 6.5% 42% 86.18***
Pregnancy “Felt Down” 9.9% 2.7% 5.9% 51% 173.87***
Pregnancy “Felt Slow” 20% 13% 23% 46% 44.90***
Pregnancy “Felt Hopeless” 3.9% 0.3% 1.3% 26% 115.30***
  1. STI, sexually transmitted infection; HIV, Human immunodeficiency virus
  2. *p < .05, **p < .01, ***p < .001