Table 2.
Clinical characteristics of first episodes of inpatients with available clinical outcome results
| Group 1 (CTA positive) | Group 2 (CC positive, CTA negative) | Group 3 (all negative) | Group 1 vs group 2 p values | Group 1 vs group 3 p values | Group 2 vs group 3 p values | |
|---|---|---|---|---|---|---|
| n | 435 | 207 | 5880 | .. | .. | .. |
| Female (%) | 243/435 (56%) | 118/207 (57%) | 3154/5876* (54%) | .. | .. | .. |
| Mean age, (years; SD) | 69 (20) | 66 (21) | 64 (21) | .. | .. | .. |
| Mean white cell count (×109/L; SD) | 12·4 (8·9) | 10·1 (5·8) | 9·9 (10·7) | 0·0004 | <0·0001 | 0·6970 |
| Mean rise in creatinine (%; SD) | 37% (63) | 52% (147) | 33% (85) | 0·1238 | 0·2270 | 0·0028 |
| >100% rise in creatinine (%) | 40/316 (13%) | 21/169 (12%) | 447/4729 (9%) | .. | .. | .. |
| Mean albumin (g/L; SD) | 31 (7) | 32 (8) | 34 (8) | 0·5226 | <0·0001 | 0·0017 |
| Albumin <20 g/L (%) | 13/344 (4%) | 11/166 (7%) | 241/4855 (5%) | .. | .. | .. |
| Died (%) | 72/435 (16·6%) | 20/207 (9·7%) | 503/5880 (8·6%) | 0·022 | <0·0001 | 0·530 |
| Mean length of stay before sample (days; SD) | 18·0 (29) | 14·1 (24) | 10·7 (21) | 0·1584 | <0·0001 | 0·0157 |
| Mean length of stay after sample (days; SD) | 19·4 (25) | 18·6 (27) | 14·2 (22) | 0·9498 | <0·0001 | 0·0022 |
| Death rate per 1000 inpatient days | 9·03 | 5·33 | 6·26 | 0·0195 | 0·0033 | 0·4224 |
CTA=cytotoxin assay. CC=cytotoxigenic culture.
*
Sex was not recorded for four patients in this group.