Table 2.
Grading systems used in the included guidelines.
| Grading systems | Guideline organizations | Level of evidence | Strength of recommendations |
|---|---|---|---|
| GRADE | WHO, 2014 [16]; ACS, 2015 [23]; ECIBC, 2020 [25]; CTFPHC, 2018 [27]; MOH of Brazil, 2018 [34]; NCC China, 2021 [32] | High; Moderate; Low; Very low | Strong; Qualified/Conditional; Weak |
| GRADE + RAM | ACR, 2017 [19] | Strong; Moderate; Limited | Usually appropriate; May be appropriate; Usually not appropriate |
| USPSTF | USPSTF, 2010 [7]; ACOG, 2019 [24] | Ⅰ; Ⅱ-1; Ⅱ-2; Ⅱ-3; Ⅲ | A; B; C; D; I (insufficient) |
| USPSTF + GRADE | MOH of Malaysia, 2019 [31] | Ⅰ; Ⅱ-1; Ⅱ-2; Ⅱ-3; Ⅲ | Strong; Conditional |
| OCEBM | EUSOMA, 2010 [26]; AWMF, DKG, and DKH, 2018 [28] | 1 a/1 b/1 c; 2 a/2 b; 3 a/3 b; 4; 5 | A; B; C; D |
| OCEBM + GRADE | CBR, SBM, and FEBRASGO, 2018 [35] | None | A; B; C; D |
| NCCN | NCCN, 2019 [18] | 1; 2 A; 2 B; 3 | A; B; C; D |
| Adapted from the Infectious Disease Society of America-United States Public Health Service Grading System | ESMO, 2019 [8] | Ⅰ; Ⅱ; Ⅲ; Ⅳ; Ⅴ | A; B; C; D; E |
| JRGCSG | NCC Japan, 2016 [9] | None | A; B; C; D; I (insufficient) |
| MOH, Singapore | MOH of Singapore, 2010 [30] | 1++; 1+; 1-; 2++; 2+; 2-;3; 4 | A; B; C; D; GPP |
Abbreviations: ACOG: American College of Obstetricians and Gynecologists; ACS: American Cancer Society; ACR: American College of Radiology; AWMF: German Association of Scientific Medical Societies; CBR: Brazilian College of Radiology and Diagnostic Imaging; CTFPHC: Canadian Task Force on Preventive Health Care; DKG: German Cancer Society; DKH: German Cancer Aid; ECIBC: European Commission Initiative on Breast Cancer; ESMO: European Society for Medical Oncology; EUSOMA: European Society of Breast Cancer Specialists; FEBRASGO: Brazilian Federation of Gynecological and Obstetrical Associations; GPP: Good Practice Points; GRADE: Grading of Recommendations, Assessment, Development and Evaluations; JRGCSG: Japanese Research Group for the Development of Cancer Screening Guidelines; MOH: Ministry of Health; NCC: National Cancer Centre; NCCN: National Comprehensive Cancer Network; OCEBM: Oxford Centre for Evidence-based Medicine; RAM: RAND/UCLA Appropriateness Method; SBM: Brazilian Society for Breast Disease; USPSTF: U.S. Preventive Services Task Force; WHO: World Health Organization.