Skip to main content


Fig. 4 | BMC Medicine

Fig. 4

From: Registration of published randomized trials: a systematic review and meta-analysis

Fig. 4

Meta-regression analysis of the prevalence of trial registration in relation to publication year. Each circle represents one study, and the size of each circle represents the weight given to the study in meta-regression. Separate meta-regression models were fitted in 7 studies that reported trial registration data by publication year. The black dashed line corresponds to an overall meta-regression model across these 7 studies with 11 studies that examined RCTs published in a single year. It showed that the proportion of registered trials increased over time, from 23% in 2005 to 52% in 2015 (29% increase, p = 0.03)

Back to article page