Association of duration of residence in the southeastern United States with chronic kidney disease may differ by race: the REasons for Geographic and Racial Differences in Stroke (REGARDS) cohort study

Table 2 Crude prevalence of albuminuria and reduced kidney function and crude incidence of end-stage renal disease, by race and southeastern residence duration categories

Outcome	Lifetime southeastern residence duration
	White					Black
	None	<Half	≥Half	All	P	None	<Half	≥Half	All	P
Crude prevalence of albuminuria
No. of events	670	245	399	560	0.044^a	534	443	243	671	0.037^a
No. of individuals	5619	2348	3377	4380	0.149^b	2728	2431	1541	3373	0.876^b
Prevalence (%)	11.9	10.4	11.8	12.8	0.149^b	19.6	18.2	15.8	19.9	0.876^b
Crude prevalence of reduced kidney function
No. of events	619	218	347	497	0.042^a	316	301	152	417	0.067^a
No. of individuals	5640	2364	3414	4418	0.670^b	2714	2443	1552	3420	0.895^b
Prevalence (%)	11.0	9.2	10.2	11.3	0.670^b	11.6	12.3	9.8	12.2	0.895^b
Crude incidence of end-stage renal disease
No. of events	23	5	12	8	0.278^a	30	29	15	48	0.076^a
No. of individuals	5839	2447	3504	4564	0.192^b	2866	2537	1618	3575	0.009^b
Incidence (per million person-years)	1149.5	589.8	1007.6	536.1		2829.2	3152.7	2891.9	4262.9

Southeastern U.S. states included: North Carolina, South Carolina, Georgia, Alabama, Mississippi, Tennessee, Arkansas, and Louisiana; other included the 40 other contiguous U.S. states (excluding Alaska and Hawaii).
^aBy χ² (albuminuria, reduced kidney function) and log-rank (end-stage renal disease) tests of equality across southeastern exposure categories.
^bBy Cochran-Armitage (albuminuria, reduced kidney function) and log-rank (end-stage renal disease) tests for trend across southeastern exposure categories.

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