Table 1 Characteristics of studies that entered the meta-analysis stage
Rows | Name [references] | country | Year of publish | Mean age of case group (SD) | Mean age of control group (SD) | Case Group Population | Control group population |
|---|---|---|---|---|---|---|---|
1 | Amorim, Fernanda Gobbi [28] | Brazil | 2011 | 54.9 +  1.1 | 54.9 +  1.1 | 72 | 71 |
2 | Ansari, Wafa Munir [29] | Pakistan | 2017 | 42±3.80 | 42±3.80 | 340 | 310 |
3 | Babu, Baddela M. V. Srikanth [30] | India | 2012 | 53.56 ±11.72 | 52.62 ± 8.45 | 651 | 432 |
4 | Banerjee, Indranil [31] | India | 2009 | 56.3 ± 12.1 | 56.0 ± 9.5 | 210 | 232 |
5 | Basso, F [32]. | America | 2002 | 56±5 | 56±5 | 498 | 1108 |
6 | Bhanushali, A. A [33]. | India | 2013 | 48±11 | 50±11 | 100 | 150 |
7 | Chen, H [34]. | China | 2018 | 61.00 ± 10.49 | 60.37 ± 10.38 | 322 | 429 |
8 | Elsaid, A [35]. | Egypt | 2014 | 53.54 ± 9.1 | 45.3 ± 7.2 | 108 | 143 |
9 | Fan, W. H [36]. | China | 2011 | 52.1 ± 6.8 | 52.3 ± 8.8 | 84 | 130 |
10 | Fragoso, J. M [22]. | Mexico | 2010 | 58.88 ±11.7 | 56.03 ±4.13 | 284 | 247 |
11 | Galimudi, R. K [37]. | India | 2014 | 65±5 | 64±6 | 200 | 200 |
12 | Gao, Y. L. [38] | China | 2016 | 61.50±10.53 | 52.54±10.65 | 275 | 286 |
13 | Ghazouani, Lakhdar [39] | Tunisia | 2010 | 58.1±12.0 | 56.7±14.1 | 418 | 406 |
14 | Humphries, S. E [40]. | England | 2001 | 56·7±3·6 | 56·0±3·4 | 162 | 2589 |
15 | Indumathi, B [41]. | India | 2019 | 56.00 ± 12.00 | – | 265 | 205 |
16 | Jabir, N. R [42] | Saudi Arabia | 2017 | 60.6±8.85 | 47.7±5.06 | 90 | 89 |
17 | Jia, X. W [43]. | China | 2010 | – | – | 231 | 210 |
18 | Jun, M [44]. | China | 2017 | 63.5±13.6 | 64.2±14.1 | 860 | 862 |
19 | Li, L. [45] | China | 2015 | – | – | 365 | 365 |
20 | Maitra, A [46]. | India | 2008 | 57.17 ± 9.22 | 45.53 ± 5.98 | 46 | 40 |
21 | Mao, L. [47] | China | 2016 | 62.65 ± 9.72 | 56.82 ± 9.80 | 224 | 260 |
22 | Mastana, S [48]. | India | 2017 | 49.51±11.06 | 45.02±14.46 | 143 | 136 |
23 | Mitrokhin, V [49]. | Russia | 2017 | 70.37±13.45 | 74.94±7.43 | 198 | 116 |
24 | Nauck, M [50]. | Germany | 2002 | 63.77±9.89 | 58.30±11.83 | 2575 | 729 |
25 | Omer, W [51]. | Turkey | 2016 | 42 ±3.80 | 39 ± 7.8 | 340 | 310 |
26 | Phulukdaree, Alisa [52] | India | 2013 | 37.5 | – | 41 | 61 |
27 | Rios, D. L. S [53]. | Brazil | 2010 | – | – | 414 | 253 |
28 | Sarecka-Hujar, Beata [54] | Poland | 2008 | 43.8±6.1 | 35.4±10.4 | 177 | 202 |
29 | Satti, H. S [55]. | Pakistan | 2013 | 46.4 ± 18.7 | 35.2 ± 17.4 | 36 | 52 |
30 | Sekuri, C [56]. | Turkey | 2007 | 46.3 ±7.8 | 44.3 ±7.2 | 115 | 105 |
31 | Shabana, N. A [4]. | Pakistan | 2018 | 59.10 ± 12.64 | 56.0 ± 10.4 | 404 | 219 |
32 | Sun, G. Q [57]. | China | 2014 | 61.2 ± 8.5 | 56.4 ± 11.6 | 296 | 327 |
33 | Tong, Z. C [58]. | China | 2013 | 61.4±8.7 | 60.6±9.6 | 326 | 341 |
34 | Tütün, Ufuk [59] | Turkey | 2006 | 29.3± 4.3 | 31.1 ± 4.0 | 21 | 50 |
35 | Wang, K [60] | China | 2015 | 65.4 ± 8.4 | 64.9 ± 8.2 | 402 | 402 |
36 | Yang, H. T [61]. | China | 2015 | – | – | 410 | 410 |
37 | Yao, H. M [17]. | China | 2016 | 62.64±8.43 | 61.43±7.85 | 275 | 296 |