From: Imputing HIV treatment start dates from routine laboratory data in South Africa: a validation study
Specificity | Truly initiated ART = no | ||
---|---|---|---|
HGB/ALT + CD4 | HGB/ALT only | ||
Ever had an ART workup? | Yes | 79 | 84 |
No | 35,556 | 35,551 | |
Total | 35,635 | 35,635 | |
Specificity | 99.8% | 99.8% | |
Positive Predictive Value (PPV) | Had ART workup = yes | ||
HGB/ALT + CD4 | HGB/ALT only | ||
Known ART start date in 6mo after ART workup date? | Yes | 17,970 | 18,393 |
No | 866 | 963 | |
Total | 18,836 | 19,329 | |
PPV | 95.4% | 95.2% | |
Negative Predictive Value (NPV) | Had ART workup = no | ||
HGB/ALT + CD4 | HGB/ALT only | ||
Ever initiated ART? | Yes | 3009 | 2,521 |
No | 35,556 | 35,551 | |
Total | 38,565 | 38,072 | |
NPV | 92.2% | 93.4% |