Table 1.
Summary of studies included in the meta-analysis. SD = standard deviation; M/F = male/female; NOS = Newcastle-Ottawa scale.
| First author (year) | Region | Study design | Sample size | Age (mean ± SD) | Gender (M/F) | NOS |
|---|---|---|---|---|---|---|
| Bulğurcu S (2017) | Turkey | retrospective case-control | 21 | 13.7 ± 3.2 | 13/8 | 7 |
| Ha, R (2019) | Korea | retrospective case-control | 42 | 14.5 ± 4.1 | 20/19 | 6 |
| Ikinciogullari,A (2014) | Turkey | retrospective case-control | 102 | 48.94 ± 13.86 | 54/48 | 7 |
| Karli, R. (2013) | India | retrospective case-control | 46 | 45.39 ± 15.70 | 25/21 | 7 |
| Kocak, HE (2017) | Turkey | retrospective case-control | 45 | 31.1 ± 7.4 | 25/20 | 8 |
| Kum, RO (2015) | Turkey | cross-sectional historical cohort | 59 | 46.1 ± 11.91 | 38/21 | 7 |
| Lee, JS (2017) | Korea | retrospective case-control | 46 | 14.7 ± 2.81 | 26/20 | 6 |
| Mirvakili, A (2016) | Iran | prospective case-control | 108 | 45.15 ± 14.42 | 61/47 | 7 |
| Ozler, GS (2014) | Turkey | retrospective case-control | 40 | 39.4 ± 11.2 | 15/25 | 7 |
| Qiao, XF (2019) | China | retrospective case-control | 60 | 45.62 ± 13.16 | 28/32 | 7 |
| Sagit, M (2013) | Turkey | retrospective case-control | 31 | 37.45 ± 15.7 | 17/14 | 8 |
| Seo, YJ (2014) | Korea | retrospective case-control | 348 | 48.19 ± 15.22 | 171/177 | 6 |
| Ulu, S (2013) | Turkey | retrospective case-control | 47 | 47.27 ± 16.88 | 27/20 | 8 |
| Yasan, H (2013) | Turkey | prospective/retrospective case-control | 147 | 30.81 ± 11.08 | 79/68 | 7 |
| Zheng, XS (2014) | China | retrospective case-control | 40 | 44.7 ± 14.1 | 22/18 | 7 |
| DurmuşK et al. (2016) | Turkey | retrospective case-control | 140 | 47.02 ± 15.72; 48.03 ± 16.85 | 88/52 | 6 |
| Nonoyama H (2016) | Japan | retrospective case-control | 89 | 54.2 ± 17.5 | 50/39 | 8 |
| Quaranta N (2015) | Italy | retrospective case-control | 94 | 48.4 ± 16.7 | NR | 8 |