Helicobacter pylori infection and susceptibility to cardiac syndrome X: A systematic review and meta-analysis

Table 1 Characteristics of included studies

Ref.	Publication year	Location	Number of cases		Age		Gender (F/M)		Helicobacter pylori infection		Diagnostic method	NOS score
			Case	Control	Case	Control	Case	Control	Case	Control
Lanza et al[41]	2004	Italy	55	60	57 ± 8	57 ± 1	27/28	24/36	53%	64%	ELISA	9
Eskandarian et al[42]	2005	Iran	23	23	42 ± 4	41 ± 4	17/6	16/7	91%	48%	UBT	7
Eskandarian et al[43]	2006	Iran	40	40	45 ± 5	44 ± 4	29/11	28/12	95%	47.5%	UBT	7
Song et al[44]	2008	China	50	50	NA	NA	NA	NA	85.2%	46.7%	UBT	4
Said MohammadZade et al[45]	2009	Iran	54	168	54.5	55.2	42/12	125/43	81.48%	56.54%	ELISA	7
Assadi et al[46]	2009	Iran	30	30	53.2	52.6	18/12	18/12	50%	0%	UBT	6
Rasmi et al[47]	2012	Iran	88	97	53.8	45.7	56/32	61/36	98.86%	57.73%	ELISA	9
Rasmi et al[48]	2012	Iran	100	100	51.8	48.9	61/39	61/39	92%	56%	ELISA	9
Rasmi et al[49]	2013	Iran	60	60	51.8	48.9	38/22	39/21	95%	40%	ELISA	7
Rasmi et al[50]	2016	Iran	88	97	53.8	45.7	56/32	61/36	93.18%	57.73%	ELISA	6
Yu et al[51]	2018	China	61	61	NA	NA	NA	NA	92.8%	57.6%	ELISA	5

NA: Not available.