Fig. 4.

Estimated numbers of trials in the International Clinical Trials Registry Platform recruiting participants in low-, lower-middle-, upper-middle- and high-income countries, 2012

DALY, disability-adjusted life year.

Note: Only interventional and actively recruiting trials were included in the analysis. For illustration, the burdens of disease in countries in the same income groups are also presented. The error bars on the estimates of trial numbers indicate 95% confidence intervals.