Table 4.

Subgroup analysis between METS-IR index with kidney stone formation.

Characteristic	Model 1 OR (95%CI)	Model 2 OR (95%CI)	Model 3 OR (95%CI)	p for trend*	p for interaction*
Stratified by gender					0.4694
Male	1.0179 (1.0140, 1.0218)	1.0185 (1.0144, 1.0227)	1.0123 (1.0078, 1.0168)	<0.001
Female	1.0191 (1.0152, 1.0230)	1.0201 (1.0161, 1.0241)	1.0117 (1.0072, 1.0161)	<0.001
Stratified by age (years)					0.7463
20-39	1.0157 (1.0101, 1.0214)	1.0158 (1.0101, 1.0215)	1.0068 (1.0004, 1.0132)	0.025
40-59	1.0202 (1.0156, 1.0248)	1.0207 (1.0160, 1.0254)	1.0128 (1.0076, 1.0180)	<0.001
60-80	1.0195 (1.0148, 1.0243)	1.0187 (1.0138,	1.0117 (1.0064, 1.0171)	<0.001
Stratified by hypertension					0.0651
NO	1.0189 (1.0149, 1.0230)	1.0193 (1.0150, 1.0236)	1.0152 (1.0107, 1.0197)	<0.001
YES	1.0102 (1.0063, 1.0142)	1.0122 (1.0080, 1.0164)	1.0074 (1.0029, 1.0118)	0.001
Stratified by diabetes					0.3559
NO	1.0163 (1.0130, 1.0195)	1.0172 (1.0138, 1.0207)	1.0134 (1.0098, 1.0170)	<0.001
YES	1.0094 (1.0036, 1.0152)	1.0108 (1.0045, 1.0170) 0.000670	1.0075 (1.0011, 1.0140)	<0.001

Model 1 = no covariates were adjusted.

Model 2 = Model 1+age,gender,race were adjusted.

Model 3 = adjusted for all covariates except effect modifier.

*Means only in model 3.