Table 1 Information on the basic characteristics of the included studies
Authors | Year | Country | Number of cases | Age* | Gender (male and proportion,%) | Distance from anal edge (cm)a | Follow-up monthsb | Type of studyc | Stars of NOS | ||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
TB-1 | TB-0 | TB-1 | TB-0 | TB-1 | TB-0 | TB-1 | TB-0 | ||||||
C. Du [18] | 2012 | China | 36 | 48 |  < 60: ≥ 60 = 25: 11 |  < 60: ≥ 60 = 25: 23 | 18 (50) | 31 (64.6) |  ≤ 5: ≥ 5 = 13: 23 |  ≤ 5: ≥ 5 = 15: 34 | 71 | Case–control | 5 |
M. Huebner [25] | 2012 | America | 24 | 210 | 60.0 (12.49) | 160 (67.5) | NA | 42 | Cohort | 7 | |||
A. C. Rogers [20] | 2013 | Ireland | 18 | 71 | 59.3 (8.6) | 62.3 (12.8) | 12 (67) | 45 (63) | NA | 49 | Cohort | 7 | |
J. W. Huh [28] | 2016 | Korea | 44 | 165 | 56 (27–81) | 136 (65) |  ≤ 10 | 44 | Cohort | 6 | |||
T. Jäger [21] | 2018 | Switzerland | 81 | 47 | 64 (10) | 63 (10) | 57 (66) | 30 (34) | NA | 84a | Cohort | 7 | |
M. Swets [24] | 2018 | Holland | 99 | 199 | 59.8 (9.7) | 136 (61.5) |  ≤ 10: > 10 = 130:85 | 64.8 | Cohort | 7 | |||
A. Demir [26] | 2019 | Turkey | 46 | 29 | 56 (19–77) | 31 (68) | 20 (69) | P: 21; M: 19; D: 44 | P: 7; M: 11; D: 11 | 35 | Cohort | 6 | |
J. W. Huh [22] | 2019 | Korea | 43 | 452 | 56 (24–80) | 437 (68.4) | 4.0 | 4.0 | 56.7 | Cohort | 6 | ||
I. Trotsyuk [23] | 2019 | Germany | 38 | 65 | 67.1 (10.8) | 62.5 (9.2) | 25 (65.8) | 48 (73.8) | NA | 54.7d | Cohort | 6 | |
L. Farchoukh [13] | 2021 | America | 26 | 91 | 65 (20) | 60 (17) | 17 (65) | 52 (57) | M: 10 D: 16 | M: 43 D: 48 | 29 | Cohort | 7 |
J. K. Shin [27] | 2021 | Korea | 209 | 209 |  < 65: ≥ 65 = 154: 55 |  < 65: ≥ 65 = 146: 63 | 147 (70.3) | 146 (69.9) | NA | NA | Cohort | 7 | |