Table 1.

Specifications of studies entered the study

Row	Author [references]	Publication year	Area	Participants’ age	Sample size	Prevalence	Quality assessment
1	Erol et al. [40]	2003	Turkey	38.8 ± 1.1	72	51.3	Moderate
2	Doruk et al. [41]	2005	Turkey	41 ± 1.1	50	42	Moderate
3	Najafi et al. [42]	2006	Iran	48.1 ± 9.5	26	76	Moderate
4	Mezones et al. [43]	2008	Peru	53.3 ± 4.1	36	75	Moderate
5	Ogbera et al. [44]	2009	Nigeria	50.5 ± 1.2	58	87.9	Moderate
6	Esposito et al. [45]	2010	Italy	57.9 ± 6.9	595	53.4	Moderate
7	Ziaeirad et al. [46]	2010	Iran	46.3 ± 5.2	91	86.8	High
8	Yencilk et al. [34]	2010	Turkey	39.2 ± 9.4	62	80.6	Moderate
9	Giugliano et al. [47]	2010	Italy	35–70	659	53.1	Moderate
10	Nowosielski et al. [48]	2011	Poland	47.6 ± 7.02	133	27.06	Moderate
11	Shi et al. [49]	2012	China	47.3 ± 7.1	106	79.2	High
12	Sharifiaghdas et al. [50]	2012	Iran	42.1 ± 5.9	45	71	Moderate
13	Cortelazzi et al. [31]	2013	Italy	18–50	34	67.6	Moderate
14	Erten et al. [51]	2013	Turkey	51.3 ± 5.8	38	47.4	Moderate
15	Vafaeimanesh et al. [52]	2014	Iran	48.2 ± 6.6	110	53.6	Moderate
16	Cordero et al. [53]	2014	Mexico	40–70	120	81.6	Moderate
17	Shadman et al. [54]	2014	Iran	54.4 ± 9.8	420	94.4	Moderate
18	Bjerggaard te al [55]	2015	Denmark	65 ± 7	348	68.3	High
19	Elyasi et al. [56]	2015	Iran	42 ± 10.1	150	78.7	Moderate
20	Mazzilli et al. [57]	2015	Italy	36.6 ± 5.2	24	17	Moderate
21	Ammar et al. [58]	2016	Tunisia	40.8 ± 4.8	30	50	Moderate
22	Li et al. [59]	2016	China	51 ± 9	184	75	Moderate
23	Bak et al. [60]	2017	Poland	51.1 ± 9.7	114	68	Moderate
24	Turki et al. [61]	2017	Saudi Arabia	40–50	275	88.7	Moderate
25	Marques et al. [62]	2018	Portugal	45–70	112	70.9	Moderate