TABLE 3.
ORs (95% CIs) for global cognitive scores <7 across quartiles of iron intake among Chinese adults aged ≥55 y by characteristics: China Health and Nutrition Survey1
| Iron intake quartiles | |||||
|---|---|---|---|---|---|
| 1 (low intake; median: 14.6 mg/d) | 2 (19.3 mg/d) | 3 (23.7 mg/d) | 4 (high intake; 31.7 mg/d) | P-interaction | |
| Overall sample | 1.00 | 1.06 (0.87, 1.30) | 1.09 (0.88, 1.35) | 1.30 (1.04, 1.64) | |
| Income | 0.046 | ||||
| Low | 1.00 | 1.15 (0.83, 1.61) | 0.95 (0.67, 1.34) | 0.93 (0.65, 1.34) | |
| Medium | 1.00 | 1.02 (0.72, 1.46) | 1.20 (0.83, 1.75) | 1.59 (1.07, 2.37) | |
| High | 1.00 | 1.04 (0.70, 1.53) | 1.11 (0.73, 1.71) | 1.85 (1.18, 2.91) | |
| Overweight/obesity | 0.038 | ||||
| No | 1.00 | 1.00 (0.78, 1.29) | 0.97 (0.75, 1.26) | 1.06 (0.80, 1.41) | |
| Yes | 1.00 | 1.27 (0.91, 1.78) | 1.41 (0.97, 2.04) | 2.04 (1.38, 3.01) | |
| Hypertension | 0.914 | ||||
| No | 1.00 | 1.11 (0.86, 1.44) | 1.11 (0.85, 1.46) | 1.36 (1.02, 1.80) | |
| Yes | 1.00 | 0.95 (0.69, 1.31) | 1.02 (0.73, 1.43) | 1.15 (0.80, 1.66) | |
| Gender | 0.904 | ||||
| Men | 1.00 | 1.14 (0.78, 1.67) | 1.09 (0.74, 1.62) | 1.25 (0.84, 1.86) | |
| Women | 1.00 | 1.02 (0.80, 1.30) | 1.08 (0.83, 1.40) | 1.34 (1.00, 1.78) | |
| Urbanization | 0.647 | ||||
| Low | 1.00 | 1.33 (0.84, 2.09) | 1.45 (0.92, 2.27) | 1.65 (1.04, 2.61) | |
| Medium | 1.00 | 1.06 (0.72, 1.55) | 1.09 (0.73, 1.63) | 1.06 (0.70, 1.61) | |
| High | 1.00 | 0.97 (0.73, 1.29) | 0.94 (0.68, 1.29) | 1.35 (0.95, 1.93) | |
1
n = 4852. Mixed-effects logistic modes adjusted for age, gender, intake of energy and fat, smoking, alcohol drinking, income, urbanicity, education, physical activity, intakes of fruit and vegetable, BMI, and hypertension. Stratification variables were not adjusted in the corresponding models. Income was categorized into low, medium, and high on the basis of tertile of year-specific income.