Table 3. Repeated-Measures Longitudinal Regression of Loge Visual Field Area on Model 1 Variablesa.
| Coefficient | Estimate (SE) | 95% CI | Degrees of Freedom | t Value | Probability >|t| |
|---|---|---|---|---|---|
| b0b | 9.0416 (0.0987) | 8.8449 to 9.2383 | 72 | 91.61 | <.001 |
| b1c | 0.1282 (0.1196) | −0.1102 to 0.3667 | 72 | 1.07 | .29 |
| b2d | 0.0037 (0.0241) | −0.0436 to 0.0511 | 424 | 0.15 | .88 |
| b3e | 0.0204 (0.0283) | −0.0353 to 0.0760 | 424 | 0.72 | .47 |
a
Kinetic visual fields measured with the V4e white test light of the Goldmann perimeter on a white background of 31.5 apostilbs, scanned, and then converted to areas by custom software. Based on 74 patients and 500 observations analyzed by the MIXED procedure of SAS.
b
b0 indicates intercept for the control cohort at mean-centered time.
c
b1 indicates change in intercept at mean-centered time for the vitamin A cohort.
d
b2 indicates annual change in loge visual field area for the control cohort.
e
b3 indicates change in annual change in loge visual field area for the vitamin A cohort.