Table 2.

Subgroup analysis assessing different variables for the risk of metabolic syndrome caused by gallstone disease in included cross-sectional studies.

			Heterogeneity
Variables	Number	OR [95% Conf. Interval]	I-squared (%)	P
sample size
<300	2	1.76 (0.62-2.90)	45.6%	0.175
>300	2	1.44 (1.12-1.75)	68.2%	0.076
P=0.165
incidence rate(%)
>15	2	1.76 (0.62-2.90)	45.6%	0.175
<15	2	1.44 (1.12-1.75)	68.2%	0.076
P<0.05
Ethnicity
Others (Caucasian, Hispanics)	2	1.76 (0.62-2.90)	45.6%	0.175
East Asian	2	1.44 (1.12-1.75)	68.2%	0.076
P=0.165
calculation method
Multivariate logistic regression	3	1.55 (1.31-1.78)	12.4%	0.319
Chi- Square test	1	1.29 (1.07-1.78)	NA	NA
P=0.165

NA, Not applicable.