Accuracy of urine flow cytometry and urine test strip in predicting relevant bacteriuria in different patient populations

Table 3 Performance of the developed algorithm to detect relevant bacteriuria (≥ 10⁵ colony-forming units/ml) for all samples, samples of male and female patients and for samples of different divisions, respectively

	All samples (47,572)	Female (24,923)	Male (22,649)	Emergency& Outpatient (21,496)	Medicine (7968)	Surgery (7580)	Intensive care (2984)	Gynaecology & Obs. (3154)	Paediatrics (3305)	External (1048)
Rule-out (< 50 bacteria/μl)
Sensitivity, %	96	97	93	96	94	95	96	97	96	96
Negative predictive value, %	98	97	99	98	98	98	99	97	98	97
Rule-in (≥ 250 bacteria/μl)
Specificity, %	86	76	94	83	89	91	90	69	87	85
Positive predictive value, %	67	65	73	68	69	72	59	49	69	75
Number of undecided samples, i.e. ≥ 50 and < 250 bacteria/μl (% of total within that group)	7365 (15)	4694 (19)	2671 (12)	3245 (15)	1168 (15)	1040 (13)	471 (16)	673 (21)	600 (18)	155 (15)
Relevant bacteriuria samples within undecided samples, %	14	14	14	15	15	15	9	12	13	14

ISSN: 1471-2334