Table 3.
Univariate analysis of characteristics associated with hospitalization in STEC cases in Michigan
| Characteristic | Number with characteristic | Number (%) hospitalized | OR (95% CI) | P value* |
|---|---|---|---|---|
| STEC serogroup | ||||
| O157 | 845 | 432 (51·1) | 2·2 (1·70–2·84) | <0·0001 |
| Non-O157 | 369 | 119 (32·3) | 1·0 | – |
| Shiga toxin profile | ||||
| stx1 | 358 | 117 (32·7) | 1·0 | – |
| stx2 | 331 | 163 (49·2) | 2·0 (1·47–2·72) | <0·0001 |
| stx1, stx2 | 508 | 255 (50·2) | 2·1 (1·57–2·75) | <0·0001 |
| Clinical symptoms | ||||
| Diarrhoea only | 328 | 87 (26·5) | 1·0 | – |
| Bloody diarrhoea | 954 | 489 (51·3) | 2·9 (2·21–3·84) | <0·0001 |
| Age group (years) | ||||
| ≤10 | 305 | 107 (35·1) | 1·0 | – |
| 11–59 | 839 | 373 (44·5) | 1·5 (1·13–1·94) | 0·004 |
| ≥60 | 197 | 126 (64·0) | 3·3 (2·26–4·77) | <0·0001 |
| Gender | ||||
| Female | 714 | 328 (45·9) | 1·1 (0·86–1·32) | 0·58 |
| Male | 617 | 274 (44·4) | 1·0 | – |
| Season | ||||
| Winter and spring | 395 | 180 (45·6) | 1·0 | 0·90 |
| Summer and autumn | 954 | 431 (45·2) | 1·0 (0·80–1·29) | – |
OR, Odds ratio; CI, confidence interval.
* Likelihood ratio χ2 test.