From: Diagnostic utility of zinc protoporphyrin to detect iron deficiency in Kenyan pregnant women
Cut-point | Sensitivity | Specificity | True prevalence | PPV | NPV | Estimated prevalence |
---|---|---|---|---|---|---|
Whole blood ZPP, μmol/mol haem | ||||||
>70c | 78% | 47% | 50% | 59% | 68% | 66% |
30% | 39% | 83% | 61% | |||
10% | 14% | 95% | 56% | |||
>49d | 95% | 3.2% | 50% | 50% | 39% | 96% |
30% | 30% | 60% | 96% | |||
10% | 10% | 85% | 97% | |||
>85e | 63% | 63% | 50% | 63% | 63% | 50% |
>102e | 43% | 76% | 30% | 43% | 76% | 30% |
>160e | 13% | 90% | 10% | 13% | 90% | 10% |
Erythrocyte ZPP, μmol/mol haem | ||||||
>70f | 38% | 87% | 50% | 75% | 58% | 26% |
30% | 56% | 77% | 21% | |||
10% | 25% | 93% | 16% | |||
>40g | 64% | 68% | 50% | 66% | 65% | 48% |
30% | 46% | 81% | 42% | |||
10% | 18% | 94% | 35% | |||
>11h | 95% | 19% | 50% | 54% | 80% | 88% |
30% | 34% | 90% | 85% | |||
10% | 12% | 97% | 82% | |||
>34i | 67% | 67% | 50% | 67% | 67% | 50% |
>52i | 48% | 77% | 30% | 48% | 77% | 30% |
>81i | 27% | 92% | 10% | 27% | 92% | 10% |