TABLE 5.
MEAN QUADRANT TORTUOSITY MEASURED BY COMPUTER PROGRAM (ROPtool) FOR EACH LEVEL OF MEAN EXPERT GRADE
| MEAN EXPERT GRADE* | MEAN QUADRANT TORTUOSITY (95% CI) | P VALUE |
|---|---|---|
| 0.0 | 4.49 (4.34–4.64) | <.001 |
| 0.3 | 6.20 (5.84–6.56) | <.001 |
| 0.7 | 8.56 (7.59–9.52) | .2 |
| 1.0 | 9.67 (8.44–10.90) | .05 |
| 1.3 | 11.49 (10.16–12.83) | <.001 |
| 1.7 | 16.03 (14.01–18.05) | .002 |
| 2.0 | 21.30 (18.91–23.69) | |
| Normal (0.0–0.3) | 4.80 (4.65–4.95) | <.001 |
| Pre-plus (0.7–1.3) | 9.88 (9.17–10.59) | <.001 |
| Plus (1.7–2.0) | 19.06 (17.36–20.76) |
CI, confidence interval.
*
Three experts graded the tortuosity of each quadrant as 2 = plus disease, 1 = pre-plus disease, and 0 = normal.