Table 1. Summary of characteristics of studies included in the meta-analysis.
| Author, year |
Study type | Country | Number of study sites | Endoscopists (N = ), specialty, practice type | Colonoscopies (N = ) pre-/post- intervention | Patient sex (% male) | Median patient age | Indication (% screening-related) | Study quality |
| Berger 2017 33 | OBS | USA | 1 | 11, 100 % GI, academic | 1,113/849 | N/R | N/R | N/R | N/A * |
| Coe 2013 27 | RCT | USA | 1 | 15, 100 % GI, academic | 602/520 | 51 | 63 | 42 | NOS-8 |
| Corley 2019 32 | OBS | USA | 20 | 85, specialty N/R, setting N/R | 12,266/20,897 | 49 | 63 | 22 | N/A * |
| Evans 2019 34 | OBS | Canada | 1 | 14, specialty N/R, academic | 833/850 | ||||
| Hall 2010 31 | OBS | USA | 1 | 11, 100 % GI, academic | 550/413 | 48 | 53 | 100 | N/A * |
| Kaminski 2016 29 | RCT | Poland | 38 | 38, specialty N/R, setting: National CRC Screening Program | 14,264/10,615 | 39 | 57 | 100 | NOS-9 |
| Keswani 2015 30 | OBS | USA | 1 | 20, specialty N/R, setting N/R | 2,444/3,639 | N/R | N/R | 100 | NOS-8 |
| Wallace 2017 28 | RCT | USA | 9 | N/R | 7,480/8,673 | 59 | 47 | 70 | NOS-8 |
OBS, observational study; RCT, randomized controlled trial; GI, gastroenterologist; Sx, surgeon; NOS, Newcastle-Ottawa Scale 21 ; N/R = not reported
*
conference abstract.