TABLE 3.
Spot Vision Screener Predictability Parameters for Gold Standard Criteriaa
| Gold Standard | Sensitivity | Specificity | PPV | NPV | Est PPV | Est NPV | Prevalence |
|---|---|---|---|---|---|---|---|
| 1 | 89.5 (84.3 to 94.7) | 76.7 (70.5 to 82.9) | 73.9 (67.1 to 80.7) | 90.8 (86.2 to 95.4) | 54.8 | 95.8 | 42% |
| 2 | 80.0 (74.1 to 85.9) | 84.8 (78.8 to 90.8) | 87.0 (81.8 to 92.2) | 77.0 (70.3 to 83.7) | 62.4 | 93.1 | 56% |
| 3 | 75.3 (69.2 to 81.4) | 86.1 (80 to 92.2) | 89.4 (84.6 to 94.2) | 69.1 (61.8 to 76.4) | 63.1 | 91.7 | 61% |
PPV = positive predictive value; NPV = negative predictive value; Est = estimated
a
Sensitivity, specificity, PPV, and NPV in the study population with 95% confidence intervals. PPV and NPV as estimated for the general population (as calculated values, confidence intervals are not available) and disease prevalence for each gold standard criterion are provided. Refractive criteria as described in Table 1. Media opacity and strabismus are included as referral criteria.
The Spot Vision Screener is manufactured by Welch Allyn, Skaneateles Falls, NY.