Table 3:
Reduced ordinal logistic regression of patient characteristics and anatomic level of treatment on increased ankle-brachial index severity.*
| Odds Ratio (95% Confidence Interval) | P-value | |
|---|---|---|
| Male gender | 0.85 (0.78–0.94) | < 0.001 |
| Age (change from age 60 to 70) | 1.17 (1.11–1.23) | < 0.001 |
| ZIP population density | ||
| Urban | Reference | |
| Suburban | 1.22 (0.96–1.43) | 0.119 |
| Rural | 1.18 (0.95–1.52) | 0.130 |
| Body mass index (change from 25 to 30 kg/m2) | 0.95 (0.92–0.99) | 0.004 |
| Smoking status | ||
| Never | Reference | |
| Past | 1.31 (1.15–1.49) | < 0.001 |
| Current | 1.58 (1.31–1.93) | < 0.001 |
| History of TIA/CVA | 1.22 (1.08–1.39) | 0.002 |
| Prior surgical revascularization | 1.33 (1.11–1.62) | 0.002 |
| Anatomic level of treatment: | ||
| Aorto-iliac | Reference | |
| Femoral-popliteal | 0.70 (0.58–0.84) | < 0.001 |
| Below the knee | 0.48 (0.41–0.57) | < 0.001 |
| Hemoglobin (change from 14 to 11 mg/dL) | 1.20 (1.10–1.34) | < 0.001 |
*
Models odds of increased ABI severity category: normal to mild-moderate to severe.
Model performance measures: Concordance statistic 0.589; calibration intercept 0.091; calibration slope 0.914.
Abbreviations: CVA = cerebrovascular accident; TIA = transient ischemic attack