Table 3.

Id	First author	Publication year	Age average	Sample size	Prevalence
1	Zomorodian [25]	2011	70.4	114	41.5
2	Jafari [26]	2014	57.5	30	63.3
3	Khozeimeh [27]	2005	64	85	57.6
4	JafariNodoshan [28]	2007	71.3	72	58
5	Tavakol [29]	2001	61.3	50	75
6	Pahlavanzadeh [23]	2012	-	109	70