1. One or more outpatient prescription claim for EQW (Exenatide Once Weekly) vs. IG (Insulin Glargine) between February 1, 2012, and June 30, 2014 (date of first claim = index date; medication to which first claim corresponds = index therapy).

2. Aged 18 or older as of the index date.

3. Continuous enrollment in medical and pharmacy benefits for 12 months before (baseline period) and 12 months after (follow-up period) the index date. (6 months follow-up will be provided to determine the effect on sample size.)

4. One or more medical claims with a diagnosis code for T2DM (ICD-9-CM 250.x0 or 250.x2) in the baseline period or on the index date.

1. No outpatient prescription claims for any injectable glucose-lowering medication during the baseline period (GLP-1RA or insulins).

2. No medical claims with a diagnosis (or procedure, where appropriate) code indicative for type 1 diabetes mellitus (ICD-9-CM 250.x1 or 250.x3), gestational diabetes (ICD-9-CM 648.8x), or pregnancy or childbirth in the baseline or follow-up periods.