Table 4

Step-by-step adjusted HRs for 30-day mortality by amputation type for age (≥75 vs. 50–64 years) and ethnicity (Māori vs. European/other)

Major amputation 30-day mortality adjusted HR (95% CI)1Minor amputation 30-day mortality adjusted HR (95% CI)1
Age: ≥75 vs. 50–64 years (reference)
 Crude1.34 (1–1.79)3.02 (1.84–4.96)
 Demographic factor
  Sex1.33 (1–1.78)3.01 (1.84–4.95)
  Ethnicity1.62 (1.18–2.22)3.87 (2.29–6.55)
  Deprivation1.6 (1.16–2.19)4 (2.36–6.77)
  Rurality1.6 (1.16–2.2)4 (2.37–6.75)
 Health system factor
  Hospital volume1.59 (1.16–2.19)4.04 (2.39–6.83)
  Admission type1.58 (1.14–2.17)4.14 (2.45–7)
 Patient-level factor
  Comorbidity1.59 (1.15–2.18)4.15 (2.45–7.03)
Ethnicity: Māori vs. European/other (reference)
 Crude1.3 (1–1.68)1.21 (0.75–1.94)
 Demographic factor
  Age1.58 (1.19–2.11)2.06 (1.24–3.4)
  Sex1.55 (1.17–2.07)2.06 (1.24–3.4)
  Deprivation1.56 (1.15–2.1)1.82 (1.08–3.06)
  Rurality1.5 (1.11–2.04)1.71 (1.01–2.9)
 Health system factor
  Hospital volume1.51 (1.11–2.04)1.73 (1.02–2.93)
  Admission type1.46 (1.08–1.98)1.72 (1.02–2.93)
 Patient-level factors
  Comorbidity1.46 (1.08–1.98)1.73 (1.02–2.94)
  • 1Adjusted for all other covariates.