Fig. 1From: Clinical drug trials in general practice: how well are external validity issues reported?Reporting of external validity issues in 134 drug trials in general practice published 2000–2015. a–f shows the development over time of reporting of (a) clinical setting, (b) screened individuals, (c) eligibility criteria, (d) participants’ co-morbidity, (e) co-medication, and (f) race/ethnicityBack to article page