Results of orthoptic screening (phase I) by test items and cumulated, in 1093 children for whom the gold standard was obtained and who were not treated for amblyopia or amblyogenic risk factors before screening. Inconclusive results of orthoptic screening items were excluded to compute the proportion of gold standard “positive” cases which were detected by each item, and the resulting per item sensitivity and specificity
| Inconclusive results | Positive results | Negative results | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Screening item | No | % | No | % | No | % | No of conclusive results | Proportion of detected gold standard “positive” cases* | Sensitivity | Specificity |
| *Proportion of detected cases with positive gold standard among all cases with positive gold standard in children with conclusive result for the screening item (equal to sensitivity). | ||||||||||
| Inspection | 0 | 0.0 | 2 | 0.2 | 1091 | 99.8 | 1093 | 1/26 | 3.8% | 99.9% |
| Ocular motility/head posture | 47 | 4.3 | 12 | 1.1 | 1034 | 94.6 | 1046 | 3/25 | 12.0% | 99.1% |
| Cover testing | 51 | 4.7 | 13 | 1.2 | 1029 | 94.1 | 1042 | 4/25 | 16.0% | 99.1% |
| Visual acuity | 118 | 10.8 | 63 | 5.8 | 912 | 83.4 | 975 | 19/22 | 86.4% | 95.4% |
| Cumulated | 118 | 10.8 | 79 | 7.2 | 896 | 82.0 | 975 | 20/22 | 90.9% | 93.8% |