Table 2.

Multivariate logistic regression models of risk factors for anemia among adults ≥65 years in NHANES III, Phase 2, 1991–1994

Variable	ORa	95% CI	P-value
Model 1
Log selenium	0.68	0.56–0.84	<0.0001
Model 2
Log selenium	0.74	0.60–0.91	0.005
Age (years)	1.04	1.01–1.07	0.005
Male	1.60	1.10–2.35	0.015
Black	2.97	2.04–4.33	<0.0001
Education <12 years	1.21	0.81–1.80	0.36
Model 3
Log selenium	0.75	0.58–0.97	0.03
Age (years)	0.99	0.96–1.04	0.87
Male	1.27	0.79–2.05	0.32
Black	3.23	1.95–5.35	<0.0001
Education <12 years	1.14	0.69–1.86	0.61
Body mass index (kgm−2)b
<18.5	0.80	0.23–2.78	0.73
25.0–29.9	1.54	0.88–2.71	0.13
≥30	1.08	0.52–2.25	0.83
Diabetes mellitus	1.39	0.30–0.74	0.30
Cardiovascular disease	0.86	0.53–1.40	0.55
Renal disease	5.48	2.63–11.41	<0.0001
Osteoarthritis	2.37	1.28–4.38	0.006

Abbreviations: CI, confidence intervals; OR, odds ratio.

^aOR per 1 s.d. increase in log_e selenium.

^bBMI of 18.5–24.9 kgm⁻² is the reference category.