Diagnostic utility of zinc protoporphyrin to detect iron deficiency in Kenyan preschool children: a community-based survey

Table 4 Diagnostic performance of zinc protoporphyrin-haem ratio, with dichotomised test results, to detect iron deficiency

	n/n	Estimate	(CI)
Whole blood ZPP > 70 μmol/mol haem
Sensitivity	27/27	100.0%	(84.4%–100.0%)^a
Specificity	2/54	3.7%	(0.9%–14.4%)^a
Positive predictive value	27/79	34.2%	(23.5%–46.7%)^a
Negative predictive value	2/2	100.0%	(28.6%–100.0%)^a
Prevalence	79/81	97.5%	(91.4%–99.3%)^b
Erythrocyte ZPP > 40 μmol/mol haem
Sensitivity	27/27	100.0%	(84.4%–100.0%)^a
Specificity	4/50	7.4%	(2.6%–19.5%)^a
Positive predictive value	27/77	35.1%	(24.2%–47.8%)^a
Negative predictive value	4/4	100.0%	(44.4%–100.0%)^a
Prevalence	77/81	95.1%	(88.0%–98.1%)^b

ISSN: 2052-1839