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. Author manuscript; available in PMC: 2012 Mar 30.
Published in final edited form as: Ophthalmology. 2008 Nov 18;116(2):200–207. doi: 10.1016/j.ophtha.2008.08.051

Table 3.

Generalized estimating equation (GEE) model estimates of baseline factors associated with the probability of 3+ dB loss of MD in the 2 to 9 year period.*

Variable OR Confidence Interval P-Value
Follow-up time (per year) 1.20 (1.15, 1.25) <0.0001
Age (per 10 years) 1.35 (1.14, 1.60) 0.0006
Range of 6 Baseline IOP Measures 0.0006
 Range ≥ 8.5 mmHg vs < 8.5 mmHg 1.96 (1.34, 2.88)
Baseline MD * Treatment 0.1170
 MD0 = -2 / Surgery vs Medicine 1.09 (0.69, 1.71) 0.7205
 MD0 = -10 / Surgery vs Medicine 0.65 (0.39, 1.08) 0.0970
Baseline MD * Cataract 0.0075
 MD0 = -2 /Cataract vs No Cataract 4.54 (2.99, 6.90) <0.0001
 MD0 = -10 /Cataract vs No Cataract 1.98 (1.22, 3.22) 0.0057
Diabetes * Treatment 0.0470
 Diabetic/Surgery vs Medicine 1.86 (0.83, 4.16) 0.1310
 Non-Diabetic/Surgery vs Medicine 0.74 (0.50, 1.11) 0.1465
 Surgery/ Diabetic vs Non-Diabetic 2.12 (1.10, 4.10) 0.0245
 Medicine/Diabetic vs Non-Diabetic 0.85 (0.46, 1.58) 0.6067

MD = Mean Deviation; MD0 = Baseline Mean Deviation

*

GEE model for MD included the following covariates: time, MD0, treatment, age, cataract, diabetes, range of baseline IOP measures, and the following interactions: MD0 by treatment, MD0 by cataract, and diabetes by treatment.