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

Table 2

Characteristics of individual studies included in the meta-analysis of OPN level and urolithiasis.

OPN level in urine
Year	Author	Ethnicity	Country	Sample size	Case	Mean	SD	Control	Mean	SD
2013	Safarinejad et al. [26]	Asian	Iran	1026	342	0.028	0.021	684	0.048	0.027
2012	Salama et al. [24]	Asian	Saudi Arabia	25	15	21.67	3.7	10	58.88	1.7
2012	Kolbach et al. [23]	Caucasian	USA	26	13	2.5	1.5	13	4.0	2
2010	Liu et al. [16]	Asian	China	496	249	0.029	0.024	247	0.050	0.031
2003	Huang et al. [20]	Asian	China	64	32	101.8	13.1	32	55.9	10.8
1999	Yasui et al. [21]	Asian	Japan	60	47	35.77	27.92	13	88.79	35.28
1996	Bautista et al. [22]	Caucasian	England	57	34	0.76	0.71	23	0.79	0.76
OPN level in serum
Year	Author	Ethnicity	Country	Sample size	Case	Mean	SD	Control	Mean	SD
2013	Safarinejad et al. [26]	Asian	Iran	1026	342	4.2	1.6	684	6.4	1.6
2013	Tugcu et al. [25]	Caucasian	Turkey	219	127	4.5	2.8	92	8.3	3.7
2012	Salama et al. [24]	Asian	Saudi Arabia	25	15	11.20	2.30	10	20.25	3.80