Table 2

 General literature search for types of research evidence on gout*

Type of evidenceMEDLINE 1966–Old MEDLINE 1950–1966EMBASE 1980–CINAHL 1980–Science Citation Index 1945–Cochrane 1996–Total
*Search was undertaken systematically according to the strategies described in appendix 1 and appendix 2 (http://www.annrheumdis.com/supplemental).
†Observational studies include cohort studies, case–control studies, and cross sectional studies.
CT, controlled trial; RCT, randomised controlled trial.
Systematic reviews2015132748
RCTs/CTs527529655451611539
Observational studies†5651453860601633
Economic evaluations17056318296
Total111168201711721903316