Table. Observed to Expected Ratios for Primary Total Knee Arthroplasty Rates Among 1 277 714 White Medicare Beneficiaries in the Urban Centers or Outlying Areas of Selected Health Referral Regions.
| Health referral regiona | Beneficiaries living in the urban center, % | Observed to expected ratio | |||
|---|---|---|---|---|---|
| Overall | Urban center | Outlying area | Difference, outlying minus urban | ||
| Lexington, Kentucky | 14.7 | 0.81 | 0.81 | 0.81 | 0 |
| Syracuse, New York | 12.0 | 0.84 | 0.72 | 0.85 | 0.13 |
| San Antonio, Texas | 48.6 | 0.86 | 0.72 | 1.00 | 0.28 |
| Albuquerque, New Mexico | 38.3 | 0.97 | 0.87 | 1.04 | 0.17 |
| Bakersfield, California | 35.8 | 1.01 | 0.93 | 1.06 | 0.13 |
| Phoenix, Arizonab | 55.1 | 1.04 | 0.95 | 1.15 | 0.20 |
| Wichita, Kansas | 25.3 | 1.43 | 1.13 | 1.55 | 0.42 |
| Lincoln, Nebraska | 35.2 | 1.57 | 1.35 | 1.70 | 0.35 |
| Salt Lake City, Utah | 12.7 | 1.64 | 1.28 | 1.69 | 0.41 |
a
Selected regions had a large geographic area, an urban center with a population of 100 000 or more, and an observed to expected ratio at the low, middle, or high end of the distribution.
b
Includes the Phoenix, Mesa, and Scottsdale metropolitan areas.