Publication rates stratified by trial characteristics among a 10% random subsample of completed trials registered in the ClinicalTrials.gov database.

*p-Value for Pearson Chi-square testing the null hypothesis that publication rates among industry, government, and nonindustry/nongovernment sponsored trials are no different.**p-Value for Pearson Chi-square testing the null hypothesis that publication rates among trials that compared an intervention with placebo, trials that compared an intervention with another active agent, trials with no comparison, and observational studies are no different.***p-Value for Pearson Chi-square testing the null hypothesis that publication rates among trials with and without end dates provided are no different.aAmong interventional trials that reported a trial phase only.bThe median trial sample size was 160.cIn comparison with trials that did not include older adults.dIn comparison with trials that did not include children.