Table 1 Characteristics of the included studies
No. | First author | Publication year | Location | Age (years) | Median follow-up period (years) | OH, n(%) | SCH, n(%) | EU, n(%) | Total, n | Score |
|---|---|---|---|---|---|---|---|---|---|---|
1(16) | Diez | 2004 | Spain | 55–83 | 2.6 | 28(26.2) | 39(36.4) | 40(37.4) | 107 | 9 |
2(18) | Imaizumi | 2011 | Japan | 55–86 | 4.2 | 5(7.0) | 27(38.0) | 38(53.5) | 70 | 9 |
3(17) | Somwaru | 2012 | America | ≥ 65 | 2 | 8(2.3) | 208(60.5) | 128(37.1) | 344 | 9 |
4(19) | Rosário | 2016 | Brazil | 20–71 | 5 | 46(19.1) | 140(58.1) | 55(22.8) | 241 | 8 |
5(20) | Sridhar | 2018 | India | 2–16 | 1 | 3(7.5) | 16(40.0) | 21(52.5) | 40 | 7 |
6(21) | Abu-Helalah | 2021 | Jordan | 18–79 | 0.5 | 28(12.4) | 30(13.3) | 166(73.8) | 224 | 8 |
7(22) | Amouzegar | 2022 | Iran | ≥ 20 | 10 | 43(15.9) | 118(43.7) | 109(40.4) | 270 | 8 |
8(23) | Zhong | 2022 | China | ≥ 40 | 3 | 27(4.6) | 266(45.8) | 270(46.5) | 563 | 9 |