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Original Articles

Commensurate Priors on a Finite Mixture Model for Incorporating Repository Data in Clinical Trials

Pages 151-160 | Received 01 Mar 2015, Published online: 02 Jun 2016
 

ABSTRACT

Docosahexaenoic acid (DHA) is a good source of fat that can be taken up through food, such as fish, or taken as a supplement. Evidence is building that DHA provides a high-yield, low-risk strategy to reduce preterm birth and/or low birth weight. These births are great costs to society. A recently completed Phase III trial revealed that higher birth weight and gestational age were associated with DHA dosed at 600 mg/day. In this article, we take a posterior predictive approach to assess impacts of these findings on public health. Simple statistical models are not adequate for accurate posterior predictive distribution estimation. Of particular interest is that the joint distribution of birth weight and gestational age is well modeled by a finite mixture of three normal distributions. Data from our own clinical trial exhibit similar features. Using the mean and variance-covariance matrices from a previous study and flexible commensurate priors for the mixing parameters, we estimate the effect of DHA supplementation on over 20,000 infants born in hospitals demographically similar to the hospital where the clinical trial was conducted.

Funding

This work was supported in part by DHA Supplementation and Pregnancy Outcomes 1R01 HD047315 (Gajewski, Colombo, & Carlson) and Kansas Frontiers: The Heartland Institute for Clinical and Translational Research CTSA UL1TR000001 (Gajewski). The contents are solely the responsibility of the authors and do not necessarily represent the official views of the NIH.

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