Utility of dipstick urinalysis in the diagnosis of urinary tract infections among outpatients in Mwanza and Dar es Salaam regions in Tanzania

Bulletin of the National Research Centre

Table 2 Comparisons of predictive values and diagnostic likelihood ratios between urinary leucocytes and nitrite in diagnosing UTI

Characteristics	Leucocytes	Nitrites	Difference	Test statistics		P—value
Sensitivity	77.74%	9.89%	− 67.86	235.556		< 0.001
Specificity	45.48%	98.75%	53.27	503.191		< 0.001

Characteristics	Leucocytes	Nitrite	Ratio	95% Confidence Level		P-Value
Characteristics	Leucocytes	Nitrite	Ratio	Lower CL	Upper CL	P-Value
Positive predictive value	35.02%	75.00%	0.47	0.39	0.56	< 0.001
Negative predictive value	84.39%	74.35%	1.14	1.10	1.18	< 0.001
Positive diagnostic likelihood ratio	1.43	7.94	0.18	0.09	0.34	< 0.001
Negative diagnostic likelihood ratio	0.49	0.91	0.54	0.44	0.66	< 0.001