The performance of IRIS evaluated by iterative testing using various thresholds
| Criteria – bacteria and WBC count | Neg. Crit. + Neg. Cult. | Pos. Crit. + Pos. Cult. | Pos. Crit. + Neg. Cult. | Neg. Crit. + Pos. Cult. | Specificity | Sensitivity |
|---|---|---|---|---|---|---|
| BACT, bacteria; Neg. Crit., negative criteria; Neg. Cult., negative culture; Pos. Crit., positive criteria; Pos. Cult., positive culture; WBC, leucocytes. | ||||||
| 939 ⩾15 BACT or ⩾100 WBC | 394 | 129 | 334 | 8 | 54.1% | 94.8% |
| 939 ⩾15 BACT or ⩾80 WBC | 385 | 130 | 343 | 7 | 54.4% | 94.9% |
| 939 ⩾15 BACT or ⩾50 WBC | 352 | 131 | 376 | 6 | 48.4% | 95.6% |