Table 1.

Characteristics of the studies selected for the meta-analysis

Authors	Geographic regions	Sample size	Sampling methods	AMI age (year) (mean ± SD)
				Total	Men	Women
Ahmadi et al.25	Tehran	20750	Census	61.20 ± 13.40	59.60 ± 11.80	65.40 ± 12.60
Farshidi et al.26	Bandar Abbas	227	Census	57.93 ± 13.10	Unknown	Unknown
Gholi et al.27	Karaj	140	Convenient	58.80 ± 11.50	Unknown	Unknown
Hadjian and Jalali28	Babol	1233	Census	60.60 ± 11.20	60.10 ± 11.80	61.50 ± 11.00
Hasan pour et al.29	Shahr-e Kord	150	Convenient	57.70 ± 10.50	Unknown	Unknown
Hojat30	Jahrom	150	Convenient	55.92 ± 11.00	Unknown	Unknown
Sezavar et al.16	Tehran	1829	Census	60.63 ± 13.50	56.90 ± 12.90	66.10 ± 11.60
Kazemy and Sharifzadeh31	Birjand	918	Census	60.70 ± 12.10	58.90 ± 12.20	65.30 ± 10.70
Kiani et al.32	Zahedan	213	Convenient	58.30 ± 12.60	Unknown	Unknown
Taghipour et al.23	Amol	366	Convenient	58.70 ± 12.20	57.44 ± 13.30	65.40 ± 12.60
Mohammadian et al.33	Isfahan	12815	Census	61.85 ± 12.60	60.00 ± 12.50	66.72 ± 11.30
Beyranvand et al.34	Tehran	300	Convenient	56.60 ± 9.50	55.50 ± 9.50	58.20 ± 9.40
Momeni et al.35	Rasht	162	Convenient	60.29 ± 12.40	59.71 ± 12.90	60.87 ± 11.90
Sharif Nia et al.1	Amol	169	Convenient	59.49 ± 11.68	57.34 ± 13.60	61.64 ± 9.50
Rajaei Behbahani et al.36	Tehran	33831	Census	62.91 ± 0.50	59.70 ± 0.80	66.13 ± 0.10
Rostamzadeh et al.37	Urmia	81	Census	60.00 ± 7.80	57.40 ± 13.50	67.10 ± 9.00

AMI: Acute myocardial infarction; SD: Standard deviation