Table 1.
The main characteristic of the included studies.
| The first author (year) | Country | Study design | Gender (M/F) |
Mean age | Sample n |
O n (%) |
A n (%) |
B n (%) |
AB n (%) |
Prevalence |
|---|---|---|---|---|---|---|---|---|---|---|
| Sunny Dzik et al. (2020) | United State | Retrospective | NR | NR | 957 | 465 (48.6) | 311 (32.5) | 140 (14.6) | 41 (4.3) | O > A > B > AB |
| Jiao Zhao et al. (2020) | China | Retrospective | 1030/858 | NR | 2173 | 486 (25.7) | 715 (37.9) | 494 (26.2) | 193 (10.2) | A > B>O > AB |
| Michael Zietz et al. (2020) | United Stat | Retrospective | NR | NR | 682 | 312 (45.7) | 233 (34.2) |
116 (17.0) | 21(3.1) | O > A > B > AB |
| Juyi Li et al. (2020) | China | Retrospective | 1143/1010 | NR | 2153 | 554 (25.7) | 819 (38.0) |
561 (26.1) | 219 (10.2) | A > B>O > AB |
| AKAN GÖKER et al. (2020) | Turkey | Retrospective | 100/86 | 42 | 186 | 46 (24.7) | 106 (57.0) |
20 (10.8) | 14 (7.5) | A > O>B > AB |
| Ghada Ali Aljanobi et al. (2020) | Saudi Arabia | Retrospective | 24/48 | 50 | 72 | 24 (33.3) | 17 (23.6) |
24 (33.3) | 7 (9.7) | O = B > A > AB |
| Yuqin Wu et al. (2020) | China | Retrospective | 97/90 | NR | 187 | 41(21.9) | 69 (36.9) | 63(33.7) | 14 (7.5) | A > B>O > AB |
| Rebecca K. Leaf et al. (2020) | United State | Prospective | 1297/736 | 62 | 2033 | 950 (46.7) | 666 (32.8) | 328 (16.1) | 89 (4.4) | O > A > B > AB |
| Falah Hasan Obayes AL-Khikani et al. (2020) | Iraq | Retrospective | NR | NR | 1775 | 458 (25.8) | 670 (37.7) | 469 (26.4) | 178 (10.0) | A > B>O > AB |
| Christopher A. Latz et al. (2020) | United State | Retrospective | 1207/872 | 56.6 | 1289 | 587 (45.5) | 440 (34.1) | 201 (15.6) | 61 (4.7) | O > A > B > AB |
| Michael Hultström et al. (2020) | Sweden | Retrospective | NR | NR | 64 | 28 (43.8) | 27 (42.2) | 6 (9.4) | 3 (4.7) | O > A > B > AB |
| Michael Zietz et al. (2020) | United Stat | Retrospective | 5024/365 | NR | 5389 | 2541 (47.2) | 1755 (32.6) | 879 (16.3) | 214 (4.0) | O > A > B > AB |
| Marion Kibler et al. (2020) | France | Retrospective | 7/15 | 82 | 22 | 4 (18.2) | 18 (81.8) | 0 (0) | 0 (0) | A > O |
| Eduardo Muñiz-Diaz et al. (2021) | Cyprus | Retrospective | 338/516 | 45 | 854 | 345 (40.8) | 403 (47.7) | 65 (7.7) | 32 (3.8) | A > O>B > AB |
| İhsan Solmaz et al. (2020) | Turkey | Cross-sectional | NR | NR | 1667 | 447 (26.8) | 753 (45.2) | 311 (18.7) | 156 (9.4) | A > O>B > AB |
| Qian Fan et al. (2020) | China | Case-control | 55/20 | 57 | 105 | 23 (21.9) | 45 (42.9) | 28 (26.7) | 9 (8.6) | A > O>B > AB |
M/F: male/female, NR: Not reported.