Assessing the quality of randomized controlled urological trials conducted by korean medical institutions

To assess the quality of randomized controlled urological trials conducted by Korean medical institutions.

Quality assessment was conducted by using the Jadad scale; in addition, the van Tulder scale and the Cochrane Collaboration risk of bias tool were used as individual indices. All assessments were performed by two reviewers. If the outcomes differed, the two reviewers and a third reviewer adjusted the discrepancy in the results through discussion. Starting from 1986, a quality analysis of randomized controlled trials (RCTs) was conducted in 1-year and 5-year units. The quality assessment was conducted by subject, type of intervention, presence of double blinding, presence of funding, and review by an Institutional Review Board (IRB).

Whereas the number of RCTs published has gradually increased, there was no significant difference in the quality of the RCTs according to publication year. Drug studies, double-blind studies, studies with funding, and studies reviewed by IRBs had higher quality scores and a higher percentage of high-quality RCTs than did other studies. Thirty-six RCTs were published in journals included in the Science Citation Index and 20 RCTs were published in journals included in the Science Citation Index Expanded. The largest number of RCTs (32.32%) were published by the Korean Journal of Urology.

A quantitative increase was observed in RCTs over time, but no qualitative improvement in the RCTs was observed. It seems necessary to put effort into the quality improvement of RCTs at the design stage.