The association between diabetes related medical costs and glycemic control: A retrospective analysis

Table 2 Identification of individuals included in studyBy HbA_1c levels

Inclusion Criteria	Good HbA _1c	Fair HbA _1c	Poor HbA _1c
Oral antidiabetic drugs only (no insulin)	4,265 (70%)	2,408 (67%)*	696 (62%)* ^‡
Oral antidiabetic drugs plus insulin	424 (7%)	562 (16%)*	264 (23%)* ^‡
Insulin only with ICD-9-CM code of Type 2 Diabetes	346 (6%)	350 (10%)*	112 (10%)*
No diabetic medication with at least two ICD-9-CM diagnoses of Type 2 Diabetes	1,034 (17%)	266 (7%)*	53 (5%)* ^‡
Sample Size	6,069	3,586	1,125

Classification at any time during the post-period based upon inclusion/exclusion criteria for study.
In addition, individuals had to be continuously insured from at least 12 months prior and 24 months post index date and have at least 2 HbA_1c values in the post-period.
Pairwise differences between groups tested using students t-test, z-statistic or Mann-Whitney test.
*Significant below 0.05 compared to the good control group
^‡Significant below 0.05 between Fair and Poor control groups

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