The first national study on regional differences in health care delivery. The work is an outgrowth of a number of years of study of regional variations in health care practices by John Wennberg, MD, and his group. Included are data on resources available, including hospital beds and hospital employees; physician specialties; physician practice patterns, such as solo and group practice; resource use; and Medicare inpatient reimbursement for acute short-stay care. Note that Medicare reimbursements rather than hospital costs are included, and thus regional differences in payment formulas and allowances for teaching hospitals are reflected. This does not account for the size of the regional differences. The Atlas is published by America Hospital Publishing, Inc.