Collaboration ratios of industry- and non-industry–sponsored clinical trials.

<p>The radial barplot shows the proportion of international trials (in dark blue) per country for (left) industry- and (right) non-industry–sponsored trials in countries where at least 50 industry- or non-industry–sponsored trials were initiated during the 2006–2013 period. The 72 countries considered for industry- sponsored and the 62 countries considered for non-industry–sponsored trials were grouped by income groups. For each income group and sponsor type, the red line represents the mean proportion of international clinical trials. The exact collaboration ratios per country of industry- and non-industry-sponsored trials per country can be found on <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0145122#pone.0145122.s012" target="_blank">S5</a> and <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0145122#pone.0145122.s013" target="_blank">S6</a> Tables respectively. In all Eastern European and South American countries except Brazil, more than 90% of industry-sponsored research was international, whereas the proportion of international non-industry–sponsored research was lower and more variable, ranging from 25.0% in Colombia to 60.9% in Hungary.