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Table 3 Univariate and multivariate Cox proportional hazards models for variables associated with suicide and accidental death in study patients

From: Risk of suicide and accidental deaths among elderly patients with cognitive impairment

Variable HR (95% CI)
Suicide death Accidental death
Univariate Multivariate Univariate Multivariate
Total dementia
 Age, yearsa 4.24 (0.58–31.28) 5.14 (0.69–38.50) 2.31 (1.07–4.99) 2.21 (1.04–4.68)
 Occupational status
  Yes Reference Reference Reference Reference
  No 2.76 (1.16–6.51) 3.71 (1.54–8.95) 2.06 (1.19–3.59) 2.09 (1.20–3.63)
 Education, yearsa 0.96 (0.88–1.03) 0.96 (0.89–1.03) 1.00 (0.97–1.05) 1.01 (0.98–1.05)
 Clinical neuropsychiatric scores
  K-MMSEb 1.02 (0.84–1.06) 1.01 (0.95–1.09) 1.00 (0.96–1.05) 0.99 (0.96–1.03)
  S-IADLa 0.98 (0.95–1.03) 0.99 (0.95–1.02) 1.02 (1.01–1.04) 1.06 (1.01–1.08)
  K-NPIa 1.88 (0.86–4.15) 1.01 (0.99–1.03) 1.01 (1.00–1.02) 1.00 (0.99–1.01)
Mild cognitive impairment
 Age, yearsa 1.07 (0.03–3.27) 1.07 (0.35–3.25) 3.81 (1.02–12.74) 3.63 (1.12–11.79)
 Occupational status
  Yes reference reference reference reference
  No 0.99 (0.13–3.21) 0.96 (0.32–2.90) 0.79 (0.33–1.89) 0.76 (0.34–1.73)
 Education, yearsa 0.90 (0.82–0.99) 0.90 (0.81–0.99) 1.07 (1.01–1.13) 1.01 (1.00–1.13)
 Clinical neuropsychiatric scores
  K-MMSEb 1.04 (0.88–1.20) 1.04 (0.91–1.19) 1.03 (1.00–1.15) 1.05 (0.95–1.15)
  S-IADLa 0.99 (0.89–1.10) 0.97 (0.87–1.07) 1.10 (1.02–1.14) 1.08 (1.03–1.12)
  K-NPIa 0.94 (0.91–1.05) 0.99 (0.94–1.05) 1.01 (1.00–1.05) 1.02 (1.00–1.05)
  1. Abbreviation: CI confidence interval, HR Hazard ratio, K-MMSE Korean Mini-Mental State Examination, K-NPI Korean version of Neuropsychiatric Inventory, S-IADL Seoul Instrumental Activity of Daily Living
  2. The hazard ratio was significant (p < 0.05)
  3. aThe hazard ratio is for each 1-year increase in age or 1-point increase in clinical scores
  4. bThe hazard ratio is for each 1-point decrease in clinical scores