The Change in HbA1c Associated with Initial Adherence and Subsequent Change in Adherence among Diabetes Patients Newly Initiating Metformin Therapy

Table 1

Characteristics of three analysis samples.

	Sample 1 ( = 2,844)	Sample 2 ( = 2,416)	Sample 3 ( = 861)
Age	58.6	59.3	58.0
% men	54.1%	53.9%	57.7%
Nonwhite	18.1%	16.8%	20.7%
Duration < 1 year	55.9%	55.1%	44.4%
HbA1c at Time 1	8.3%	n/a	n/a
HbA1c at Time 2	7.0%	6.9%	7.8%
HbA1c at Time 3	n/a	7.1%	7.8%
Metformin dose (mgs) at Time 2	1,124	1,129	1,055
Metformin dose (mgs) at Time 3	n/a	1,223	1,404