... 75,93,94,113 Only one of the experimental studies was a randomized controlled trial. 75 Across both observational and experimental studies, 41 articles compared EHR use across different groups of users including comparisons by specialty (14 studies), 4,7,25,29,31,36,42,48,51,58,59,85,105,115 clinical role (12), 24,26,33,37,46,65,76,95,99,106,108,115 gender (8), 19,34,47,49,66,68,70,106 year in residency (8), 31,32,35,39,52,56,57,95 organization (3), 24,44,75 and country (1). 27 Vendor-measure studies were more likely than investigator-measure studies to make such comparisons of EHR use by user group (65% vs 25% of studies, P < .001). ...