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Table 2 Comorbidity

From: Repeated ambulance use is associated with chronic diseases - a population-based historic cohort study of patients’ symptoms and diagnoses

  All patients One-time users Two-time users Frequent users
Charlson Comorbidity Indexa
 0 40 184 (61%) 29 987 (68%) 6 002 (50%) 4 195 (43%)
 1 9 421 (14%) 5 173 (12%) 2 184 (18%) 2 064 (21%)
 2 5 555 (9%) 3 033 (7%) 1 300 (11%) 1 222 (12%)
 3+ 5 299 (8%) 2 301 (5%) 1 414 (12%) 1 584 (16%)
 Not brought to hospital 5 473 (8%) 3 605 (8%) 1 042 (9%) 826 (8%)
  1. Ambulance runs for each of the user groups and comorbidity (a based on ambulance runs with hospital contacts)