Table 5. Results of Logistic Regressions of Enrollment in Another HMO for Beneficiaries Living in Counties with Choice of Another Medicare HMO: 2001.
| Independent Variable | Report Enrolling in Another HMO after Plan Withdrawal1 | Enrolled in Medicare+Choice Plan after Plan Withdrawal, per CMS Administrative Records2 | ||
|---|---|---|---|---|
|
|
|
|||
| Odds Ratio | 95 Percent Confidence Interval | Odds Ratio | 95 Percent Confidence Interval | |
| Intercept | 0.63 | 0.47-0.84 | 0.17 | 0.12-0.26 |
| Age | ||||
| Under 65 Years (Disabled) | 0.92 | 0.61-1.40 | 1.50 | 0.95-2.39 |
| 65 Years or Over | 1.00 | — | 1.00 | — |
| Sex | ||||
| Female | 1.16 | 0.94-1.42 | *1.29 | 1.02-1.62 |
| Male | 1.00 | — | 1.00 | — |
| Race/Ethnicity | ||||
| All Other Racial Groups and Hispanic | 1.03 | 0.76-1.39 | 0.94 | 0.68-1.30 |
| White Non-Hispanic | 1.00 | — | 1.00 | — |
| Education | ||||
| Less than 9th Grade | 1.04 | 0.75-1.45 | 0.97 | 0.68-1.39 |
| 9th Grade or More | 1.00 | — | 1.00 | — |
| Self-Reported Health | ||||
| Poor or Fair | 0.85 | 0.67-1.07 | 0.82 | 0.64-1.05 |
| Good or Excellent | 1.00 | — | 1.00 | — |
| Hospitalized in Past 12 Months | ||||
| Yes | 1.07 | 0.82-1.38 | 0.95 | 0.72-1.25 |
| No | 1.00 | — | 1.00 | — |
| CMS Region | ||||
| Region 63 | *0.72 | 0.55-0.94 | 0.88 | 0.65-1.17 |
| Other Regions | 1.00 | — | 1.00 | — |
| County | ||||
| Non-Metropolitan | 1.59 | 0.83-3.07 | 0.69 | 0.23-2.03 |
| Metropolitan | 1.00 | — | 1.00 | — |
| Medicare Managed Care Market Penetration | ||||
| High (35-45 Percent) | *6.58 | 4.15-10.43 | *22.89 | 13.59-38.54 |
| Moderate (15-34 Percent) | *3.91 | 2.99-5.12 | *9.21 | 6.35-13.37 |
| Limited (6-14 Percent) | *1.74 | 1.27-2.38 | *3.25 | 2.12-4.99 |
| Minimal (1-5 Percent) | 1.00 | — | 1.00 | — |
| Monthly Medicare Payment Rate to Medicare+Choice Organization | ||||
| Less than $525 | 0.93 | 0.53-1.64 | *0.35 | 0.14-0.83 |
| $525 | *0.70 | 0.54-0.90 | 0.87 | 0.66-1.14 |
| More than $525 | 1.00 | — | 1.00 | — |
| Information about Plan Withdrawal | ||||
| Not Enough Information | 0.81 | 0.65-1.01 | *0.67 | 0.52-0.85 |
| Enough Information | 1.00 | — | 1.00 | — |
p<0.05.
Model is significant. Cox & Snell R-square for dependent variable having Medicare only = 0.10.
Model is significant. Cox & Snell R-square for dependent variable HMO enrollment according to administrative records = 0.20
Centers for Medicare & Medicaid Services Region 6 consists of the following States: Arizona, Louisiana, New Mexico, Oklahoma, and Texas.
NOTES: Initial sample size for these logistic regressions was 2,215. HMO is health maintenance organization. Metropolitan/non-metropolitan county designation based on the 1993 Office of Management and Budget definition. Medicare managed care market penetration groups based on characterization of Medicare markets by the Center for Studying Health System Change.
SOURCE: Booske, B.C., University of Wisconsin at Madison, Lynch, J., RTI International, and Riley, G., Centers for Medicare & Medicaid Services, 2001.