Table 3 Previous morbidity as risk factor for HCV seropositivity test among blood donors in southern Brazil
Variable | % cases (n = 178) | % controls (n = 356) | Unadjusted OR (95%CI) | Adjusted OR (95%CI)* |
|---|---|---|---|---|
Time since last blood transfusion (years) | Â | Â | Â | Â |
   >10 | 9.6 | 2.5 | 4.2 (1.8–9.6) | 9.9 (3.6–27.2) |
   ≤ 10 | 19.0 | 24.4 | 0.9 (0.5–1.4) | 0.8 (0.4–1.5) |
   P value |  |  | 0.002 | <0.00001 |
Time since hospital admission for clinical treatment (years) | Â | Â | Â | Â |
   ≤ 10 | 14.0 | 8.7 | 1.9 (1.1–3.3) | 2.2 (1.0–4.6) |
   >10 | 17.4 | 11.8 | 1.7 (1.0–2.9) | 1.9 (1.0–3.6) |
   Any time | 1.1 | 0.3 | 4.7 (0.4–52.3) | 2.9 (0.1–57.1) |
   P value |  |  | 0.03 | 0.09 |
Time since parenteral drug treatment (years) | Â | Â | Â | Â |
   ≤ 10 | 24.2 | 31.2 | 0.8 (0.5–1.3) | 0.6 (0.3–1.2) |
   >10 | 27.5 | 22.2 | 1.3 (0.8–2.0) | 1.1 (0.6–2.0) |
   Any time | 5.1 | 1.1 | 4.7 (1.4–15.9) | 3.9 (1.0–15.3) |
   P value |  |  | 0.02 | 0.05 |
Acupuncture therapy | 5.6 | 4.2 | 1.4 (0.6–3.4) | 2.6 (0.9–7.2) |
   P value |  |  | 0.5 | 0.08 |
Previous jaundice | 9.6 | 2.0 | 4.6 (1.8–11.9) | 4.6 (1.9–11.3)** |
   P value |  |  | <0.0001 | 0.001 |