| Cano-Valderrama O [34] | 2023 | Spain | Retrospective Cohort Single center | 2019.9−2020.1 | 2020.9−2021.3 | 169 | 220 | Patients who were referred to a multidisciplinary team |
| Forse CL [24] | 2021 | Canada | Retrospective Cohort Single center | 2019.8−2020.1 | 2020.8−2021.1 | 173 | 165 |
| Pirozzi BM [33] | 2023 | Italy | Retrospective Cohort Single center | 2018.3−2020.2 | 2020.3−2022.2 | 147 | 133 |
| Miyo M [25] | 2022 | Japan | Retrospective Cohort Multicenter | 2019.3−2020.2 | 2020.3−2021.2 | 3,569 | 3,198 |
| Freund MR [26] | 2022 | USA | Retrospective Cohort Single center | 2016.3−2020.2 | 2020.3−2021.2 | 180 | 54 |
| Eklöv K [21] | 2022 | Sweden | NDB | 2019.3−2019.8 | 2020.3−2020.8 | 590 | 550 |
| Eklöv K [22] | 2022 | Sweden | NDB | 2019 | 2020 | 4,016 | 3,964 | Compared with data from 2019 |
| Rottoli M [27] | 2022 | Italy | Retrospective Cohort Multicenter | 2019.3−12 | 2020.3−12 | 1,755 | 1,481 |
| Chen MZ [28] | 2022 | Australia | Retrospective Cohort Multicenter | 2018.7−2019.2 | 2020.7−2021.6 | 700 | 906 |
| Tarta C [29] | 2022 | Romania | Retrospective Cohort Single center | 2019 | 2020−2021 | 163 | 84 |
| Meijer J [20] | 2022 | Netherlands | NDB | 2020 2−8 weeks | 2020. 1) 9−11 weeks 2) 12−17 weeks 3) 18−26 weeks | 410 | 161 231 385 | Division of period: according to the proportion of expected colonoscopy performance |
| Ghosh S [30] | 2022 | USA | Retrospective Cohort Single surgeon | 2019.4−2020.3 | 2020.4−2020.9 | 344 | 166 |
| Tang G [31] | 2022 | China | Retrospective Cohort Single center | 2019.1−2019.3 | 2020.1−2020.3 | 136 | 68 |
| Uyan M [35] | 2022 | Turkey | Retrospective Cohort Single center | 2019.3−2019.12 | 2020.3−2020.12 | 56 | 48 |
| Kudou M [44] | 2022 | Japan | Retrospective Cohort Single center | 2018−2019 | 2020−2021 | 91 | 67 | Only included minimally invasive surgery cases –emergency cases were excluded |
| Kiss BI [36] | 2022 | Romania | Retrospective Cohort Single center | 2019.3−2020.3 | 2020−2021 | 160 | 142 |
| Choi JY [13] | 2021 | Korea | Retrospective Cohort Single center | 2018.3−2018.9 2019.3−2019.9 | 2020.3−2020.9 | 1,985 | 916 |
| Kuryba A [40] | 2021 | England | NDB | 2019.3−20.3.23 | 2020.3.23− | 11,703 | 3,227 |
| Williams E [37] | 2021 | Australia New Zealand | Retrospective Cohort Multicenter | 2017−2019 | 2020− | 1,565 | |
| Radulovic RS [45] | 2021 | Serbia | Retrospective Cohort Single center | 2019 | 2020.3−2021.4 | 152 | 49 |
| Lee T [38] | 2022 | Singapore | Retrospective Cohort Single center | 2019.10−2020.4 | 2020.4−2020.10 | 41 | 64 |
| Lim JH [39] | 2021 | Korea | Retrospective Cohort Single center | 2017−2019 | 2020 | 2,514 | 715 |