Table 4.

Regression model selected for TZD analysis.

Variable	β	Std. Error	p-value
Intercept	−1.22	0.05	<2 × 10−16
Pre-treatment HbA1c	−0.67	0.02	<2 × 10−16
Principal component 1	−0.07	0.02	1.94 × 10−4
Principal component 2	−0.03	0.02	0.14
Principal component 3	−0.03	0.02	0.17
Baseline age	−0.07	0.02	1.98 × 10−4
Years diabetic	0.11	0.02	5.02 × 10−10
BMI	−0.11	0.02	4.12 × 10−8
Metformin score 1	0.03	0.10	0.80
Metformin score 2	−0.46	0.16	4.49 × 10−3
Metformin score 3	−0.47	0.08	1.79 × 10−9
Metformin score 4	−0.12	0.05	0.02