Association between diabetes and heel ulcer in 18 946 patients with 28 642 admissions between October 2008 and September 2010. The model was progressively adjusted for known and novel risk factors
| Model | OR (95% CI) | χ2 | P value |
| Adjusted for age and sex | 2.24 (1.87 to 2.62) | 17.94243 | <0.001 |
| Adjusted for above and length of stay | 2.21 (1.76 to 2.65) | 12.33788 | <0.001 |
| Adjusted for above and comorbidity (Charlson Index) | 2.23 (1.79 to 2.67) | 12.61275 | <0.001 |
| Adjusted for above and day of admission | 2.24 (1.80 to 2.69) | 12.67092 | <0.001 |
| Adjusted for above and specialty | 2.27 (1.82 to 2.72) | 12.90961 | <0.001 |
| Adjusted for above and admission type | 2.24 (1.79 to 2.69) | 12.55047 | <0.001 |