Table 6.

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
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%

BACT, bacteria; Neg. Crit., negative criteria; Neg. Cult., negative culture; Pos. Crit., positive criteria; Pos. Cult., positive culture; WBC, leucocytes.