Table 1.

Characteristic of included studies, prevalence of thyroid cancer

Author, year, reference	Mean age (years)	City	Sample size	Sample size (male)	Sample size (female)	Prevalence %	Prevalence (male)	Prevalence (female)	Quality
Moayeri, 2001, [19]	10.9	Tehran	148	92	56	1.4	-	-	High
Safavi, 2016, [20]	45	Tehran	438	-	-	3.2	-	-	High
Zekoi, 2006, [21]	47.5	Khorasan	180	108	72	1.1	-	-	Medium
Shahbazi, 1998, [22]	51.14	Shahrekord	50	-	-	2.0	-	-	High
Shahbazi, 1999, [22]	-	Shahrekord	59	-	-	5.1	-	-	High
Shahbazi, 2000, [22]	-	Shahrekord	76	-	-	5.3	-	-	High
Shahbazi, 2001, [22]	-	Shahrekord	79	-	-	3.8	-	-	High
Shahbazi, 2002, [22]	-	Shahrekord	98	-	-	9.2	-	-	High
Mohaghegh, 2006, [23]	-	Markazi	634	375	259	3.8	4	20	High
Mohaghegh, 2005, [23]	57.3	Markazi	634	375	259	6.3	10	30	High
Mohaghegh, 2004, [23]	-	Markazi	634	375	259	5.0	8	24	High
Mohaghegh, 2003, [23]	-	Markazi	634	375	259	6.3	14	26	High
Mohaghegh, 2002, [23]	-	Markazi	634	375	259	2.7	4	13	High
Mohaghegh, 2001, [23]	60.9	Markazi	634	375	259	2.7	4	13	High
Shahesmaeili, 2014, [24]	60	Kerman	2838	1544	1294	9.2	142	119	High
Roshani, 2016, [25]	68	Iranian elderly	75,500	40,241	35,259	4.4	-	-	Medium
[26]	-	Kashan	130	112	18	9.2	2	10	High
Talaeizadeh, 2005, [27]	-	Ahvaz	100	8	92	18	-	-	High
Hajivandi, 2005, [28]	-	Bushehr	1503	646	857	6.1	48	44	Medium
Haghpanah1, 2006, [29]	-	Kerman	319	167	152	1.9	2	4	High
Haghpanah2, 2006, [29]	-	Mazandaran	319	167	152	1.6	2	3	High
Haghpanah3, 2006, [29]	-	Gilan	319	167	152	1.3	1	3	High
Haghpanah4, 2006, [29]	-	Golestan	319	167	152	0.9	1	2	High
Ahmadi, 2010, [30]	-	Southwest	2918	1735	1183	1.7	-	-	High
Ahmadi, 2011, [30]	-	Southwest	2918	1735	1183	1.9	-	-	High
Ahmadi, 2012, [30]	-	Southwest	2918	1735	1183	1.6	-	-	High
Ahmadi, 2013, [30]	-	Southwest	2918	1735	1183	1.4	-	-	High
Ahmadi, 2014, [30]	-	Southwest	2918	1735	1183	2.3	-	-	High