did not achieve significanceP = 0.29
Linearity assumption was met since all interaction terms for continuous predictor variables in the MLR did not achieve significance: age at surgery ( P = 0.29), mean VA on logMAR ( P = 0.20), VA of the poorer eye ( P = 0.18) Independence of errors: No overdispersion was found since goodness-of-fit/degree of freedom (0.025) was well under 2 Multicollinearity: Poorer VA and mean VA showed collinearity (tolerance <0.1 and variance inflation factor >10), suggesting interaction, and after consensus, the latter was dropped [ Table 4 ].