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Attack rate amongst students who consumed and those who did not consume contaminated water
| Exposure to contaminated water | Typhoid | Total | |
|---|---|---|---|
| Present (%) | Absent (%) | ||
| Present | 87 (2.63) | 3226 (97.37) | 3313 (100) |
| Absent | 11 (0.196) | 5594 (99.804) | 5605 (100) |
| Total | 98 (1.098) | 8820 (98.902) | 8918 (100) |
RR = 13.7, (95% CI of 10.8 to 16.12), Chi square = 113.18, df = 1, p < 0.0001
