Table 2.
Stepwise logistic regression model predicting adequate prenatal care
| Model | Odds ratio | p | 95% CI | |
|---|---|---|---|---|
| Step 1: | R2=.009, p=.087 | |||
| Starts with maltreatment history | Childhood maltreatment trauma | 1.627 | .097 | .915, 2.891 |
| Step 2: | R2=.031, R2Δ=.022, p=.006 | |||
| Adds pregnancy PTSD | Childhood maltreatment trauma | 2.136 | .019 | 1.134, 4.022 |
| Pregnancy PTSD diagnosis | .347 | .007 | .162, .745 | |
| Step 3: | R2=.052, R2Δ=.062, p=.001 | |||
| Adds interpersonal factors | Childhood maltreatment trauma | 2.277 | .011 | 1.205, 4.304 |
| Pregnancy PTSD diagnosis | .508 | .104 | .224, 1.151 | |
| Highest quartile interpersonal sensitivity score | .510 | .008 | .310, .841 | |
| Step 4: | R2=.064, R2Δ=.012, p<.001 | |||
| Adds risk behavior | Childhood maltreatment trauma | 2.368 | .009 | 1.245, 4.504 |
| Pregnancy PTSD diagnosis | .537 | .139 | .235, 1.225 | |
| Highest quartile interpersonal sensitivity score | .554 | .023 | .333, .922 | |
| Any Pregnancy substance use | .604 | .038 | .375, .973 | |
| Step 5: | R2=.159, R2Δ=.095, p<.001 | |||
| Adds health care related factors | Childhood maltreatment trauma | 2.888 | .004 | 1.414, 5.899 |
| Pregnancy PTSD diagnosis | .501 | .112 | .213, 1.175 | |
| Highest quartile interpersonal sensitivity score | .458 | .005 | .265, .790 | |
| Any pregnancy substance use | .594 | .039 | .362, .975 | |
| Lowest quartile Health Care Alliance Score | .553 | .021 | .335, 914 | |
| Any treatment | 2.531 | .001 | 1.491, 4.295 | |
| Insurance | .464 | .001 | .295, .729 |
Note: PTSD=posttraumatic stress disorder; CI=confidence interval