Table 1.

Specifications of studies entered in the study.

Row	Author (references)	Publication year	Area	Sample size	Prevalence
1	Karimian et al. [13]	2003	Qom	1972	11.8
2	Eghbalian [14]	2007	Hamedan	1500	19.1
3	Tootoonchi [15]	2007	Tehran	905	8.6
4	Zahed Pasha et al. [16]	2004	Babol	2228	7.7
5	Zarbakhsh et al. [17]	2012	Gilan	325	6.9
6	Delaram and Ahmadi [18]	2008	Shahr-e-kord	5102	8.5
7	Bahrami et al. [19]	2014	Qazvin	3076	6.7
8	Sobhi et al. [20]	2013	Mashhad	7763	6.1
9	Hosseini et al. [21]	2005	Tonekabon	2016	4.2
10	Shadzie et al. [22]	2000	Isfahan	848	6
11	Momeni et al. [23]	2017	Kerman	60273	9.4
12	Golestan et al. [24]	2011	Yazd	5897	8.8
13	Roudbari et al. [25]	2007	Zahedan	1109	11.8
14	Talebian and Afrouz [26]	2010	Isfahan	910	9.5