Table 3:
Dependent variables significantly associated with primary leg amputations (i.e. no preceding revascularization) among people with PAD and foot complications treated at Texas hospitals 2004–2009.
| Variable | Odds Ratio | 95% Confidence Interval | z | P-value |
|---|---|---|---|---|
| Clinical Characteristics of Foot Pathology | ||||
| foot osteomyelitis | 2.06 | (1.80, 2.35) | 10.47 | <0.001 |
| foot infection | 4.63 | (4.24, 5.06) | 33.69 | <0.001 |
| Age, Sex, Poverty, Race and Ethnicity | ||||
| >75 years of age | 1.55 | (1.43, 1.69) | 10.44 | <0.001 |
| male | 1.30 | (1.20, 1.40) | 6.38 | <0.001 |
| categorized as black | 1.79 | (1.61, 1.99) | 10.73 | <0.001 |
| categorized as Hispanic | 1.42 | (1.28, 1.57) | 6.83 | <0.001 |
| categorized as Native American | 0.43 | (0.26, 0.73) | −3.12 | 0.002 |
| Poverty | ||||
| at least 12% of population in zip code of residence living below the federal poverty level | 1.14 | (1.05, 1.24) | 3.14 | 0.002 |
| Primary or Secondary Payer | ||||
| Medicaid | 1.89 | (1.72, 2.07) | 13.81 | <0.001 |
| Medicare | 1.14 | (1.04, 1.26) | 2.74 | 0.006 |
| uninsured or charity | 1.70 | (1.45, 1.98) | 6.69 | <0.001 |
| Hospital Admission Source | ||||
| admission through emergency department or other urgent admission | 1.39 | (1.29, 1.51) | 8.10 | <0.001 |
| Geography and Other Hospital Characteristics | ||||
| low volume hospital | 1.78 | (1.63, 1.93) | 13.6 | <0.001 |
| teaching hospital designation | 1.15 | (1.01, 1.32) | 2.04 | 0.04 |
| Texas Public Health Region | ||||
| Central Texas | 1.79 | (1.58, 2.04) | 8.86 | <0.001 |
| West Central | 1.78 | (1.43, 2.22) | 5.16 | <0.001 |
| Texarkana | 2.19 | (1.89, 2.54) | 10.3 | <0.001 |
| South Plains | 2.48 | (2.01, 3.07) | 8.35 | <0.001 |
Factors not shown: medical comorbidity index; medical risk index; calendar year.