Table 6.

Adjusted estimates of group–level incidence rates of nephrolithiasis in South Carolina by age and race from 1997 to 2012: Model 5

Model 5: Race	5-yr Change in Kidney Stone Incidence among Females (95% Confidence Interval)	5-yr Change in Kidney Stone Incidence among Males (95% Confidence Interval)
White	1.13 (1.12 to 1.14)	0.97 (0.96 to 0.98)
Black	1.21 (1.18 to 1.24)	1.10 (1.08 to 1.13)
Other	1.56 (1.47 to 1.66)	1.36 (1.30 to 1.42)

Model 5 included an interaction between race, sex, and year. All models with interactions additionally included each main effect, lower–order interaction terms, and a random intercept for county of residence. Models examining for race effects were adjusted for age and sex.