Table 3. Multivariate survival model fitted with the Initial IOP (first column) or the Final IOP (second column) as predictors, together with mean Initial MD and Age.

	Blindness, Weibull parameter estimates (standard error)
Age	-0.029 (0.013)**	-0.027 (0.013)**
Mean MD	0.105 (0.023)***	0.110 (0.024)***
Mean Final IOP	0.090 (0.036)**	-
Mean Initial IOP	-	0.016 (0.028)
Intercept	6.987 (1.212)***	7.996 (1.357)***
Observations	1,606	1,606

*p<0.1

**p<0.05

***p<0.01

IOP, intraocular pressure; MD, Mean Deviation; Initial, at the beginning of follow up; Final, at the end of follow up.

Since all calculations were made to estimate the probability of becoming blind from at least one eye, MD and IOP value were calculated for each subject as the mean of the values from the affected eyes.