Table 4.
Univariable Linear Regression Models Exploring Factors Associated with Interocular Difference (Right Eye Minus Left Eye) in Average RNFL Thickness
| Interocular Difference in Average RNFL Thickness (µm) | ||||
|---|---|---|---|---|
| Predictor | Univariable | |||
| Interval/Reference | β | 95% CI | P Value | |
| Age | 1 year older | −0.04 | −0.13 to 0.04 | 0.32 |
| Gender (female) | Male | −0.03 | −1.19 to 1.13 | 0.96 |
| Race (black) | White | 0.64 | −1.89 to 3.17 | 0.62 |
| Ethnicity (Hispanic or Latino) | Not Hispanic or Latino | 0.36 | −2.80 to 3.52 | 0.82 |
| Interocular difference in average CDR | 1-unit increase | −7.36 | −13.1 to −1.62 | 0.01 |
| Interocular difference in vertical CDR | 1-unit increase | −7.07 | −12.43 to −1.71 | 0.01 |
| Interocular difference in cup volume | 1-mm3 increase | −6.55 | −13.9 to 0.81 | 0.08 |
| Interocular difference in disc area | 1-mm2 increase | 1.26 | −1.31 to 3.82 | 0.34 |
| Interocular difference in rim area | 1-mm2 increase | 7.59 | 4.00 to 11.18 | <.001 |
| Interocular difference in axial length | 1-mm increase | −1.53 | −2.97 to −0.09 | 0.04 |
| Interocular difference in signal strength | 1-unit increase | 1.30 | 0.72 to 1.88 | <.001 |
Interocular differences in all OCT parameters were calculated by subtracting left eye values from the right eye.