Table 1

Characteristics of the cohort, by amputation type

Major amputationMinor amputation
n%n%
Total cohort12,5703,782
Sex2
 Female89134.81,14730.5
 Male1,67265.22,61569.5
Age-group (years)
 0–24100.4240.6
 25–492369.245612.1
 50–6470627.51,16630.8
 65–7470827.599926.4
 ≥7591035.41,13730.1
Age (years)368.71366.613.3
Ethnicity
 Māori66525.963216.7
 Pacific1957.63569.4
 Asian622.41032.7
 European/other1,64864.12,69171.2
Deprivation (NZDep)
 1–2 (least deprived)1736.83659.7
 3–429311.545712.2
 5–645417.866217.7
 7–864525.31,02427.3
 9–10 (most deprived)98438.61,23933.1
Rurality (URPC)
 Urban1,86073.42,68172.6
 Independent urban48018.966017.9
 Rural1957.73529.5
Hospital volume (amputations/year)
 >5001,52559.92,25260.7
 100–49983032.61,10329.8
 <1001917.53529.5
Admission type
 Acute1,875732,64770
 Elective695271,13530
Comorbidity (M3 index)
 028010.942511.2
 >0–186433.61,25533.2
 >1–288334.41,22732.4
 >2–342116.466817.7
 ≥31224.72075.5
  • 1All amputation events occurred between 2005 and 2014. If an event included both a major and a minor amputation, only the major amputation was counted.

  • 2Sex data were missing for 27 patients (0.4% of amputation events).

  • 3Age data are mean and SD.