Table 4.
SD-OCT GA with VA Loss ≥ 5 Letters at the 2-Year Interval
| 2-Year Interval | ||||
|---|---|---|---|---|
| Node |
N Count |
GA Count (%) |
OR (95% CI) |
P Value |
| A | 156 | 0 (<2)∗ | - | - |
| B | 47 | 0 (<6)∗ | - | - |
| C | 89 | 6 (7) | 1.57 (0.61–4.02) | 0.35 |
| D | 251 | 20 (8) | 4.13 (1.63–10.45) | <0.01 |
| Total | 543 | 26 (5) | ||
CI = confidence interval; GA = geographic atrophy; OR = odds ratio; SD-OCT = spectral-domain OCT; VA = visual acuity.
∗
Proportions in cells with a count of zero (out of N observations) are estimated using the Rule of 3 whereby the 95% CI for the proportion (%) is between 0 and 3/N.