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Sample confidence intervals for slopes of NEI-VFQ-25 and visual acuity
| Number of subjects per class | Effective Sample Size N*4.5/(1 + (4.5-1)*0.2) | Distance from slope estimate to the two-sided 95 % confidence limits for the class-specific slope | |
|---|---|---|---|
| NEI-VFQ (Std. Dev = 17) | LogMAR VA (Std. Dev = 0.2) | ||
| 20 | 53 | +/− 0.28 | +/− 0.0033 |
| 60 | 159 | +/− 0.16 | +/− 0.0019 |
| 100 | 265 | +/− 0.12 | +/− 0.0014 |
NEI-VFQ-25 National eye instate vision function questionnaire; LogMAR VA
