Analyzing Multiply Matched Cohort Studies with Two Different Comparison Groups: Application to Pregnancy Rates among HIV+ Women

Authors: Li, Yan; Zelterman, Daniel1; Forsyth, Brian W. C.2

Source: Biometrics, Volume 59, Number 3, September 2003 , pp. 632-639(8)

Publisher: Wiley-Blackwell

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We develop a new statistical method to analyze multiply matched cohort studies with two different comparison groups. We employ a linear-logistic model to describe the underlying log-odds ratios and use a conditional likelihood approach to conduct inference. Under the assumption of homogeneous log-odds ratios, we provide methods to construct both asymptotic and exact confidence regions of the two log-odds ratios in a simple case. We propose a score test to evaluate the assumption of homogeneous log-odds ratios across strata. While our methods are general, we develop them around a specific application, namely, the study of pregnancy rates in HIV-infected women. Our analyses suggest that HIV infection is associated with a decrease in pregnancy rates and that this decrease in fertility becomes significant after accounting for illicit drug use.

Keywords: Conditional likelihood; Confidence region; Homogeneity test; Maximum likelihood estimator; Odds ratio

Document Type: Research Article


Affiliations: 1: Division of Biostatistics, Yale University, New Haven, Connecticut 06520, U.S.A. 2: Department of Pediatrics, Yale University, New Haven, Connecticut 06520, U.S.A.

Publication date: September 1, 2003

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