TABLE I.

Medicare Cohort Size by Study Sample Inclusion Criteria^*

Inclusion Criteria	No. of Patients
Medicare Part-B “carrier” claim with shoulder-related diagnosis in 2011 (index diagnosis)	2,525,519
No carrier claim with shoulder-related diagnosis in 365 days before index diagnosis in 2011	1,871,294
Continuously enrolled in Medicare Parts A and B, never enrolled in an HMO, from 365 days prior to index date to 104 days after index date	1,598,175
Age of ≥66 years at index date	1,588,184
No claim indicating emergency department or ambulance use within 1 day before index date	1,290,052
Claim indicating MRI within 90 days after index date	144,487
Rotator cuff tear diagnosis within 14 days after first MRI	65,220
Complete data available for geography measures (hospital referral region, county-level statistics)	63,075
No cervical spine pain, scapular pain, glenohumeral arthritis, humeral fracture, inflammatory arthritis, adhesive capsulitis, or dementia during period 365 days prior to index date to 104 days after index date	32,203

^*HMO = health maintenance organization.