Table 1.

Study characteristics.

Study	Type of Study	Number of patients	Number of exposed	Number of non-exposed	Total Afib	AF in non-exposed	AF in exposed	P value/CI
Mehra et al. [7]	Cross-sectional	566	228	338	14	3	11	1.03–15.74
Tanigawa et al. [8]	Prevalence	1663	688	975	26	7	19	P<0.001
Gami et al. [9]	Retrospective cohort	3542	2626	916	133	19	114	1.34 to 3.54
Zhao et al. [10]	prospective	160	128	32	36	4	32	p=0.07
Wong et al. [11]	Retrospective	545	72	473	226	178	48	1.3–2.58
Cadby et al. [12]	Prospective	6841	4352	2489	455	81	374	2.06–3.34
Mehra et al. [13]	cross-sectional	2911	2184	727	138	23	115	P<0.001
Selim et al. [14]	Cross-sectional	697	537	160	38	4	34	P>0.05
Tung et al. [15]	Prospective	2912	1440	1472	338	142	196	P>0.05