Secondary outcomes of sight-threatening errors, identification of lesion features and confidence ratings
| Ophthalmologists (n=48) | Optometrists (n=48) | OR (95% CI) | p Value | |||
|---|---|---|---|---|---|---|
| Secondary outcome | n | Per cent | n | Per cent | ||
| Sight-threatening errors | 62/994 | 6.2 | 57/994 | 5.7 | 0.93 (0.55 to 1.57) | 0.789 |
| Is there SRF? | 515/2016 | 25.5 | 627/2016 | 31.1 | 1.73 (1.21 to 2.48) | 0.002 |
| Has it increased since baseline? | 498/515 | 96.7 | 541/627 | 86.3 | ||
| Are there IRC? | 799/2016 | 39.6 | 808/2016 | 40.1 | 1.00 (0.61 to 1.65) | 0.985 |
| Has it increased since baseline? | 667/799 | 83.5 | 683/808 | 84.5 | ||
| Is there DRT? | 482/2016 | 23.9 | 826/2016 | 41.0 | 3.46 (2.09 to 5.71) | <0.001 |
| Has it increased since baseline? | 381/482 | 79.0 | 597/826 | 72.3 | ||
| Is there any PED? | 845/2016 | 41.9 | 842/2016 | 41.8 | 0.91 (0.47 to 1.79) | 0.786 |
| Has it increased since baseline? | 311/845 | 36.8 | 392/842 | 46.6 | ||
| Is there blood? | 150/2016 | 7.4 | 194/2016 | 9.6 | 1.56 (1.00 to 2.44) | 0.048 |
| New or increased since baseline? | 126/150 | 84.0 | 146/194 | 75.3 | ||
| Are there exudates? | 152/2016 | 7.5 | 380/2016 | 18.8 | 3.10 (1.58 to 6.08) | <0.001 |
| New or increased since baseline? | 38/152 | 25.0 | 87/380 | 22.9 | ||
| Confidence rating | ||||||
| 1 | 7/2016 | 0.3 | 52/2016 | 2.6 | ||
| 2 | 26/2016 | 1.3 | 140/2016 | 6.9 | ||
| 3 | 220/2016 | 10.9 | 496/2016 | 24.6 | 0.15 (0.07 to 0.32)* | <0.001 |
| 4 | 588/2016 | 29.2 | 753/2016 | 37.4 | ||
| 5 | 1175/2016 | 58.3 | 575/2016 | 28.5 | ||
| Correct lesion classifications for each confidence rating† | ||||||
| 1 | 3/7 | 42.9 | 42/52 | 80.8 | ||
| 2 | 21/26 | 80.8 | 114/140 | 81.4 | ||
| 3 | 147/220 | 66.8 | 362/496 | 73.0 | ||
| 4 | 474/588 | 80.6 | 634/753 | 84.2 | ||
| 5 | 1077/1175 | 91.7 | 550/575 | 95.7 | ||
*Comparison of optometrists versus ophthalmologists; odds of a confidence rating of 5 versus a rating of 1–4.
†For example, of the seven vignettes to which ophthalmologists gave a confidence rating of 1, three were correct with respect to the primary outcome.
DRT, diffuse retinal thickening; IRC, intraretinal cysts; OR, odds ratio; PED, pigment epithelial detachment; SRF, subretinal fluid.