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Exposure to OR personnel of case patients and non-case patients, hospital A, 23 and 27 April 1990
| Risk factor | No. (%) of case patients (n = 4) | No. (%) of non-case patients (n = 67) | RR | 95% CIa | P value |
|---|---|---|---|---|---|
| Anesthesiologist 9 | 4 (100) | 5 (7.5) | Undefined | >7.7 | 0.0003 |
| OR nurse 6 | 2 (50) | 3 (5) | 13.2 | 1.1–354 | 0.046 |
| OR nurse 10 | 2 (50) | 4 (6) | 10.8 | >5.7 | 0.005 |
CI, confidence interval.
