Roles of Osteopontin Gene Polymorphism (rs1126616), Osteopontin Levels in Urine and Serum, and the Risk of Urolithiasis: A Meta-Analysis

Table 4

Summary of SMD and 95% CI for associations between OPN level and urolithiasis risk.

Polymorphism	Subgroup		Sample size	SMD (95% CI)	value	heterogeneity
Urine	All	7	1754	−0.55 (−1.30–0.20)	0.151	<0.0001
	Large sample size	2	1522	−0.78 (−0.89 to −0.67)	<0.0001	0.749
	Asian populations	5	1671	−0.65 (−1.61–0.31)	0.182	<0.0001
Serum	All	3	1270	−1.47 (−1.89 to −1.04)	<0.0001	0.01

The number of studies.