All analyses were performed with SAS version 9.1 (SAS
Institute;Cary,NC).Descriptive covariateswere summarized
by pregnancy intention dimensions using cross tabulations
and omnibus chi-square tests. To assess construct validity of
the parsimonious scores, we examined the associations
between intention and contraceptive use near the time of
conception (yes/no) and consideration of abortion. Associa-
tions between pregnancy intention dimensions and adverse
pregnancy risk factors and outcomes were quantified using
odds ratios from unadjusted and multivariable adjusted
logistic regressions. Adjusted regressions simultaneously
modeled each of the identified intention dimensions. Addi-
tional covariates were selected for inclusion in the multivar-
iable model if their inclusion altered the pregnancy intention
measures of association by more than 10%. Due to the het-
erogeneity of the outcomes assessed in this study, separate
multivariable models were developed for each outcome.