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Case fatality by factor number (variable number)
| Factor number* | Cases (n) | Controls (n) | Case fatality† (%) |
| 0 | 0 | 11 | 0.00 |
| 1 | 6 | 60 | 9.09 |
| 2 | 5 | 49 | 9.26 |
| 3 | 12 | 14 | 46.15 |
| 4 | 9 | 7 | 56.25 |
| ≥ 5 | 4 | 3 | 57.14 |
* The variable 'local hospital treatment' was excluded, and the total number of study factors (variables) was 12.
† The chi-squared test for trend, with 1 degree of freedom, is x2 = 21.864, p = 0.000.
