Serum Homocysteine Levels in Men with and without Erectile Dysfunction: A Systematic Review and Meta-Analysis

Table 1

Studies included in the meta-analysis. Data expressed as means ± standard deviation.

Study	Country	Method	Subjects without ED			Subjects with ED
			N	Hcy	Age	N	Hcy	Age
Demir et al. [24]	Turkey	Immunoassay	33	10.7 ± 1.6	44.5 ± 4.7	31	16.4 ± 5.4	55.6 ± 8.4
Al-Hunayan et al. [29]	Kuwait	HPLC	97	8.8 ± 2.6	47.6 ± 10.1	97	11.2 ± 3.5	46.6 ± 9.9
Demir et al. [30]	Turkey	Immunoassay	30	13.1 ± 2.5	53.6 ± 6.5	32	15.5 ± 6.9	54.2 ± 7.3
Safarinejad et al. [32]	Iran	HPLC	228	9.82 ± 2.35	31.7 ± 6.6	114	12.29 ± 2.32	32.2 ± 6.4
Basar et al. [25]	Turkey	HPLC	20	10.4 ± 2.4	38.6 ± 8.2	28	13.2 ± 4.3	40.2 ± 7.5
Matos et al. [31]	Brazil	HPLC	306	11.09 ± 4.37	38.6 ± 13.99	57	11.66 ± 4.61	54.1 ± 12.83
Yan et al. [26]	China	Immunoassay	66	7.98 ± 2.8	29.41 ± 4.42	67	11.73 ± 2.81	29.12 ± 4.41
Sansone et al. [27]	Italy	HPLC	31	9.17 ± 2.32	49.14 ± 13.63	31	13.61 ± 3.55	52.83 ± 11.89
Zhang et al. [28]	China	Immunoassay	20	9.6 ± 2.6	32.8 ± 7.8	32	18.94 ± 6.19	34.08 ± 11.99