Characteristics of case and control populations
| Characteristics | Cases (n=114) | Controls (n=228) | OR (95% CI), p value |
|---|---|---|---|
| CI, confidence interval; OR, odds ratio. | |||
| Sex (men/women) | 40/74 | 80/148 | 1 |
| Age (years) | 1.06 (0.97 to 1.15), 0.2 | ||
| Mean (SD) | 61.9 (12.3) | 61.5 (12.5) | |
| Median | 65 | 64 | |
| Range | 20 to 83 | 18 to 84 | |
| Duration of disease (years) | 1.1 (1.04 to 1.14), <0.001 | ||
| Mean (SD) | 8.2 (6.2) | 4.8 (6.69 | |
| Median | 7 | 1 | |
| Range | 1 to 33 | 1 to 43 | |
| Years of schooling | 0.87 (0.83 to 1.1), 0.1 | ||
| Mean (SD) | 5.1 (2.6) | 6.3 (4.1) | |
| Median | 5 | 5 | |
| Range | 2 to 13 | 0 to 18 | |
| Hypertension (n, %) | 62, 54% | 86, 38% | 2.83 (1.6 to 4.9), <0.001 |
| Other diseases (n, %) | 15, 13% | 11, 5% | 3.05 (1.32 to 3.06), <0.01 |