Table 3.
Logistic regression analysis for amputation
| Variable | Univariable | ||
|---|---|---|---|
| OR | 95% CI of OR | P‐value | |
| Age (years) | 1·03 | 1–1·06 | 0·051 |
| Sex (ref : female); male | 1·18 | 0·6–2·33 | 0·637 |
| Ulcer history | 3·38 | 1·43–8·72 | 0·008 |
| Hypertension | 3·15 | 1·37–7·8 | 0·009 |
| Duration of diabetes (years) | 1·04 | 1·01–1·08 | 0·026 |
| Duration of hypertension (years) | 1·04 | 1–1·09 | 0·049 |
| Retinopathy | 1·47 | 0·75–2·9 | 0·263 |
| Nephropathy | 1·4 | 0·71–2·77 | 0·331 |
| Neuropathy | 2·21 | 1·08–4·63 | 0·033 |
| BMI | 0·92 | 0·84–1 | 0·075 |
| HbA1c* | 1·07 | 0·18–6·45 | 0·938 |
| Haemoglobin | 0·79 | 0·64–0·96 | 0·024 |
| WBC* | 1·23 | 0·58–2·64 | 0·592 |
| Serum creatinine* | 1·35 | 0·94–1·96 | 0·106 |
| Total protein | 0·99 | 0·67–1·46 | 0·966 |
| ESR* | 1·24 | 0·77–2·07 | 0·384 |
| CRP* | 1·33 | 1·08–1·66 | 0·009 |
| Peripheral artery disease [ref : ABI ≥ 0·9 (Normal)] | 9·07 | 3·88–22·6 | 0·001 |
ABI, ankle‐brachial index; BMI, body mass index; CI, confidence interval; CRP, C‐reactive protein; ESR, erythrocyte sedimentation rate; OR, odds ratio; WBC, white blood cell.
*
Natural logarithmic transformations were performed before analysis.