Table 5.
Race-Stratified Multivariable Logistic Regression Model of Anemia Correlates in the REGARDS Renal Ancillary Study,a United States, 2003–2007
| Black (n = 6,733) |
White (n = 10,005) |
|||
| OR | 95% CI | OR | 95% CI | |
| Demographic variables | ||||
| Age (per 10 years)b | 1.19 | 1.11, 1.27 | 1.32 | 1.21, 1.44 |
| Female gender | 1.00 | 0.87, 1.15 | 0.92 | 0.78, 1.09 |
| Living in the stroke beltc vs. other region | 1.23 | 1.08, 1.40 | 1.19 | 1.01, 1.40 |
| Socioeconomic variables | ||||
| Education less than high school | 1.20 | 1.02, 1.42 | 0.98 | 0.73, 1.31 |
| Annual income | ||||
| <$25,000 | 1.25 | 1.03, 1.51 | 1.01 | 0.78, 1.31 |
| $25,000–$75,000 | 1.20 | 1.02, 1.42 | 1.14 | 0.95, 1.37 |
| >$75,000d | 1.00 | 1.00 | ||
| Medical conditions | ||||
| Vascular diseaseb | 1.19 | 1.02, 1.39 | 1.38 | 1.16, 1.65 |
| Diabetesb | 1.78 | 1.57, 2.03 | 2.86 | 2.37, 3.44 |
| Hypertension | 1.16 | 1.00, 1.34 | 1.13 | 0.95, 1.34 |
| Ever smoker | 0.71 | 0.63, 0.81 | 0.86 | 0.73, 1.01 |
| Body mass index (per 5 kg/m2) | 1.00 | 0.99, 1.01 | 0.97 | 0.96, 0.99 |
| Anemia category | ||||
| Chronic renal insufficiency | 3.24 | 2.69, 3.89 | 4.03 | 3.36, 4.83 |
| Inflammation | 1.55 | 1.31, 1.84 | 2.13 | 1.66, 2.73 |
| Microcytosis | 3.97 | 3.31, 4.76 | 25.62 | 17.54, 37.40 |
Abbreviations: CI, confidence interval; OR, odds ratio; REGARDS, REasons for Geographic And Racial Differences in Stroke.
a
All factors listed in this table were included in the model. Variables are defined in the Materials and Methods section of the text.
b
Interaction terms between race and age, vascular disease, and diabetes were 0.046, 0.018, and 0.0004, respectively. Other interaction-term P values were >0.05.
c
North Carolina, South Carolina, Georgia, Tennessee, Alabama, Mississippi, Arkansas, Louisiana.
d
Reference category.