Table 3.

Multiple linear regression models of selenium and other risk factors with hemoglobin (g dl⁻¹) as the outcome, among adults ≥65 years in NHANES III, Phase 2, 1991–1994

Variable	Coefficient	s.e.	Standardized β	P-value
Model 1
Log selenium	9.72	2.88	0.103	0.001
Model 2
Log selenium	7.39	2.70	0.078	0.006
Age (years)	−0.16	0.05	−0.079	0.002
Male	10.09	0.76	0.371	<0.0001
Black	−6.83	0.86	−0.136	<0.0001
Education <12 years	−0.99	0.73	−0.036	0.18
Model 3
Log selenium	5.52	2.94	0.061	0.06
Age (years)	−0.03	0.06	−0.015	0.63
Male	10.65	0.82	0.410	<0.0001
Black	−6.49	1.02	−0.124	<0.0001
Education <12 years	−0.81	0.81	−0.031	0.31
Body mass index (kgm−2)a
<18.5	0.02	1.96	0.001	0.99
25.0–29.9	0.09	0.94	0.004	0.92
≥30	1.81	1.07	0.585	0.09
Diabetes mellitus	−0.58	1.24	−0.014	0.63
Cardiovascular disease	0.31	0.80	0.011	0.69
Renal disease	−4.55	1.68	−0.089	0.007
Osteoarthritis	−2.94	1.15	−0.086	0.01

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