(a) Risk factor IOP≤21mmHg p IOP≤18mmHg p IOP≤15mmHg p >3 years of pre-op therapy 1.72 (1.08-2.73) 0.02 1.62 (1.04-2.51) 0.04 - - Pre-op IOP - - 0.97 (0.94-1.00) 0.02 0.96 (0.93-0.99) 0.01 Trainee surgeon 0.54 (0.34-0.88) 0.01 0.53 (0.33-0.85) 0.002 0.58 (0.36-0.93) 0.02 Private case 3.81 (1.95-7.42) <0.0001 3.00 (1.62-5.58) 0.001 2.29 (1.32-3.99) 0.003 Mitomycin-C - - - - 1.78 (1.01-3.14) 0.04 (b) Risk factor IOP≤21mmHg p IOP≤18mmHg p IOP≤15mmHg p Pre-op IOP 0.96 (0.92-1.0) 0.03 0.95 (0.92-0.98) 0.001 0.93 (0.9-0.96) <0.0001 Trainee surgeon 0.48 (0.25-0.9) 0.02 0.46 (0.26-0.81) 0.007 0.43 (0.26-0.72) 0.001 Private case 3.33 (1.14-9.71) 0.03 2.34 (0.99-5.51) 0.05 - - (c) Risk factor IOP≤21mmHg p IOP≤18mmHg p IOP≤15mmHg p Pre-op IOP 0.93 (0.89-0.98) 0.006 0.93 (0.9-0.97) <0.0001 0.93 (0.9-0.96) <0.0001 Trainee surgeon - - - - 0.42 (0.24-0.73) 0.002 IOP: intraocular pressure

Table 3: Statistically significant risk factor odds ratios for success/failure of trabeculectomy identified by logistic regression multivariate modeling for (a) complete success (no topical therapy, no bleb needling), (b) qualified success 1 (± topical therapy, no bleb needling), (c) qualified success 2 (± topical therapy, ± bleb needling).