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Six Cox proportional hazards models were constructed for outcomes measured at repeated intervals (≥5 sexual partners; unprotected sex with casual client, regular client, or boyfriend or husband; HIV and pregnancy, all assessed at 3, 6, 9 and 12 months).
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This study was a cohort observational study of prospectively collected data based on the database that was constructed for outcome assurance from January 2004 to July 2008 at Chi Mei Medical Center.
As none of the above-stated covariates were significantly associated with three of the secondary outcomes, i.e., birth trauma, Apgar score 0 3 at 5 min, and hypoglycemia, no multivariate models were constructed for these outcomes.
Kaplan-Meier survival curves were constructed for both outcomes.
Cox's proportional hazard models were then constructed for all outcomes and adjusted for the following: age (≥ 65 years), sex, income quintile, distance to the nearest hospital (≥ 50 km), admission year, admission to a revascularization hospital, and province.
An ROC curve was constructed for each outcome.
Separate models were constructed for each outcome variable.
First, an intercept-only model (also called null model) was constructed for each outcome variable.
Separate multivariable logistic regression models were constructed for each outcome variable and each exposure variable, which included relevant confounding variables.
To assess the potential for publication bias, funnel plots were constructed for each outcome in which the log RRs were plotted against their SEs.
Models were constructed for each outcome: number of annual GP visits, number of annual specialist visits, and number of annual hospital bed-days.
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