Table 1.
Characteristics of the REGARDS Renal Ancillary Study by Race,a United States, 2003–2007
| All (n = 19,836) |
White (n = 11,843) |
Black (n = 7,992) |
||||
| No. | % | No. | % | No. | % | |
| Demographicsb | ||||||
| Age in years, mean (SD) | 64.4 (9.7) | 65.1 (9.8) | 63.4 (9.5) | |||
| Female gender | 12,340 | 60 | 6,951 | 59 | 5,388 | 67 |
| Black race | 7,992 | 40 | ||||
| Living in the stroke beltc | 11,770 | 59 | 7,281 | 61 | 4,488 | 56 |
| Socioeconomic variablesb | ||||||
| High school education | 17,596 | 89 | 11,030 | 93 | 6,565 | 82 |
| Annual income | ||||||
| <$25,000 | 3,345 | 19 | 1,350 | 13 | 1,995 | 29 |
| $25,000–$75,000 | 7,660 | 44 | 4,424 | 43 | 3,236 | 47 |
| >$75,000 | 6,261 | 36 | 4,536 | 44 | 1,724 | 25 |
| Medical conditionsb | ||||||
| Vascular disease | 4,078 | 21 | 2,481 | 21 | 1,597 | 20 |
| Diabetes | 3,926 | 20 | 1,679 | 14 | 2,246 | 28 |
| Hypertension | 11,224 | 57 | 5,715 | 498 | 5,509 | 69 |
| Ever smoker | 10,347 | 52 | 6,166 | 52 | 4,180 | 53 |
| Body mass index in kg/m2, mean (SD) | 29.4 (6.3) | 28.3 (5.7) | 31.0 (6.8) | |||
| Anemia-associated conditionsb | ||||||
| Chronic kidney disease | 2,095 | 11 | 1,324 | 11 | 770 | 10 |
| Creatinine in mg/dL, mean (SD) | 0.87 (0.33) | 0.84 (0.25) | 0.92 (0.42) | |||
| Inflammation | 1,848 | 9 | 789 | 7 | 1,059 | 13 |
| Mean corpuscular volume | ||||||
| Low (≤80 fL) | 1,070 | 5 | 196 | 2 | 874 | 11 |
| Normal (81–99 fL) | 18,188 | 93 | 11,243 | 96 | 6,944 | 88 |
| High (≥100 fL) | 401 | 2 | 295 | 3 | 106 | 1 |
Abbreviations: REGARDS, REasons for Geographic And Racial Differences in Stroke; SD, standard deviation.
a
Information on race was missing for 1 participant.
b
Variables are defined in the Materials and Methods section of the text.
c
North Carolina, South Carolina, Georgia, Tennessee, Alabama, Mississippi, Arkansas, Louisiana.