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Unpublished Paper
Analyzing Direct Effects in Randomized Trials with Secondary Interventions
(2007)
  • Michael Rosenblum
  • Nicholas P. Jewell
  • Mark J van dr Laan
  • Stephen Shiboski
  • Ariane van der Straten
  • Nancy Padian
Abstract

The Methods for Improving Reproductive Health in Africa (MIRA) trial is a recently completed randomized trial that investigated the effect of diaphragm and lubricant gel use in reducing HIV infection among susceptible women. 5,045 women were randomly assigned to either the active treatment arm or not. Additionally, all subjects in both arms received intensive condom counselling and provision, the “gold standard” HIV prevention barrier method. There was much lower reported condom use in the intervention arm than in the control arm, making it difficult to answer important public health questions based solely on the intention-to-treat analysis. We adapt an analysis technique from causal inference to estimate the ”direct effects” of assignment to the diaphragm arm, adjusting for condom use in an appropriate sense. Issues raised in the MIRA trial apply to other trials of HIV prevention methods, some of which are currently being conducted or designed.

Publication Date
2007
Citation Information
Michael Rosenblum, Nicholas P. Jewell, Mark J van dr Laan, Stephen Shiboski, et al.. "Analyzing Direct Effects in Randomized Trials with Secondary Interventions" (2007)
Available at: http://works.bepress.com/mrosenblum/14/