Table 4.
Effectiveness in referral for refractive errors or amblyopia using the lowest fifth percentile UCVA cut-off criteria
| Sensitivity, n/N (%) | Specificity, n/N (%) | PPV, n/N (%) | NPV, n/N (%) | |
| Refractive errors | ||||
| Myopia | 112/319 (35.1) | 967/1287 (75.1) | 112/432 (25.9) | 967/1174 (82.4) |
| Hyperopia | 43/84 (51.2) | 1133/1522 (74.4) | 43/432 (10.0) | 1133/1174 (96.5) |
| Astigmatism | 252/518 (48.6) | 908/1088 (83.5) | 252/432 (58.3) | 908/1174 (77.3) |
| Anisometropia | 26/59 (44.1) | 1141/1547 (73.8) | 26/432 (6.0) | 1141/1174 (97.2) |
| All | 301/762 (39.5) | 713/844 (84.5) | 301/432 (69.7) | 713/1174 (60.73) |
| Amblyopia | ||||
| AAO definition | ||||
| Unilateral amblyopia | 11/14 (78.6) | 1171/1601 (73.1) | 11/432 (2.5) | 1171/1174 (99.7) |
| Bilateral amblyopia | 14/15 (93.3) | 1173/1591 (73.7) | 14/432 (3.2) | 1173/1174 (99.9) |
| All | 25/29 (86.2) | 1170/1577 (74.2) | 25/432 (5.8) | 1170/1174 (99.7) |
| COS definition | 26/30 (86.7) | 1170/1576 (74.2) | 26/432 (6.0) | 1170/1174 (99.7) |
AAO, American Academy of Ophthalmology; COS, Chinese Ophthalmological Society; NPV, negative predictive value; PPV, positive predictive value; UCVA, uncorrected visual acuity.