Table 1 Analysis of variance between the graded images, the determined sensitivity over one Efron grade (ie, RCE is able to detect a change of 0.09 Efron units in bulbar hyperaemia reliably), and sensitivity index (where 1.00 indicates maximum sensitivity and 0.00 the inability to differentiate changes in bulbar hyperaemia), for ED and RCE objective image analysis techniques and subjective ECP and NCL grading.
| Grading technique | F | p | Sensitivity (per Efron grade unit) | Sensitivity index |
|---|---|---|---|---|
| ED | 1306.91 | 0.00 | 0.02 | 0.99 |
| RCE | 1368.54 | 0.00 | 0.09 | 0.94 |
| ECP | 10.88 | 0.00 | 1.03 | 0.30 |
| NCL | 17.52 | 0.00 | 0.68 | 0.53 |
ECP, eye‐care practitioner; ED, edge detection; NCL, non‐clinician; RCE, relative colour extraction.