Table 4.
Serum selenium levels in the types of anemia among adults ≥65 Years in NHANES III, Phase 2, 1991–1994a
| Characteristicsb,c | Non-anemic | Anemia due to nutritional causes | Anemia of chronic inflammation | Anemia due to renal disease | Unexplained anemia | P-value |
|---|---|---|---|---|---|---|
| N | 1822 | 97 | 55 | 44 | 74 | |
| Age (years) | 73.9 (0.2) | 75.7 (1.1) | 72.3 (0.8) | 81.0 (1.9) | 74.3 (0.9) | 0.0003 |
| Black (%) | 6.8 | 18.5 | 22.2 | 23.4 | 16.2 | <0.0001 |
| Women (%) | 58.2 | 45.2 | 56.7 | 61.0 | 40.9 | 0.08 |
| Body mass index (kgm−2, %) | ||||||
| <18.5 | 2.8 | 8.1 | 1.7 | 10.3 | 0 | 0.007 |
| 18.5–24.9 | 34.4 | 29.6 | 22.4 | 55.1 | 30.7 | |
| 25–29.9 | 37.6 | 49.3 | 46.9 | 31.9 | 49.5 | |
| ≥30 | 25.2 | 13.0 | 30.5 | 2.7 | 19.9 | |
| Education <12 years (%) | 41.8 | 59.0 | 57.6 | 52.2 | 44.6 | |
| Selenium (μmol l−1) | 1.60 (1.59, 1.61) | 1.50 (1.42, 1.57) | 1.50 (1.40, 1.61) | 1.54 (1.40, 1.68) | 1.54 (1.47, 1.60) | 0.009 |
| Hemoglobin (g l−1) | 141.7 (0.4) | 114.8 (1.6) | 117.0 (1.5) | 111.0 (1.8) | 117.8 (1.2) | <0.0001 |
| Current smokers (%) | 23.2 | 28.0 | 6.8 | 15.3 | 6.5 | 0.08 |
| Chronic diseases (%) | ||||||
| Hypertension | 46.5 | 53.0 | 69.4 | 65.5 | 36.2 | 0.02 |
| Osteoarthritis | 16.4 | 27.7 | 31.1 | 12.7 | 32.3 | 0.06 |
| Diabetes | 11.3 | 16.9 | 23.7 | 15.0 | 23.9 | 0.02 |
| Congestive heart | ||||||
| Failure | 7.5 | 8.2 | 20.3 | 11.8 | 7.4 | 0.11 |
| Stroke | 8.4 | 8.2 | 9.0 | 11.2 | 11.7 | 0.82 |
| Angina | 31.9 | 43.7 | 31.3 | 38.2 | 26.4 | 0.42 |
| Myocardial infarction | 12.9 | 15.8 | 16.3 | 5.6 | 12.1 | 0.78 |
| Cardiovascular disease | 39.9 | 48.5 | 38.9 | 53.0 | 35.4 | 0.53 |
| Cancer | 21.7 | 21.3 | 28.6 | 13.2 | 29.1 | 0.52 |
a
Weighted analysis for all means and percentages using NHANES III weights.
b
Mean (s.e.) for age and hemoglobin.
c
Geometric mean (CI) for selenium.