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Table 2 Case-mix difference by rarity index among healthcare facility groups in Japan

From: Functional mapping of hospitals by diagnosis-dominant case-mix analysis

    Disease categories by rarity index
    Rare diseases Intermediate diseases Common diseases
Rarity index    2.20–7.53 1.60–2.15 0.87–1.59
DPC disease category name (excerpts)    Pheochromocytoma, paraganglioma; Malignant cardiac tumour; Tuberculous meningitis, meningoencephalitis; Acquired deformation of femur; Orbital tumour Malignant breast tumour; Tachycardic arrhythmia; Malignant gastric tumour; Chronic sinusitis; Rheumatoid arthritis of upper limb (from shoulder to hand) Hypertensive disease (without organ damage); Type 2 diabetes (excluding diabetic ketoacidosis) and diabetes not elsewhere classified*; Cataract and other disorders of the lens; Metabolic disorders other than diabetes mellitus; Asthma
Ratio of patients with each disease category for each group of facilities‡ (%) Inpatient† MTH 79.9 (79.5 – 80.3) 15.2 (14.9 – 15.6) 4.8 (4.6 – 5.1)
   OTH 74.4 (74.1 – 74.7) 19.7 (19.4 – 20.0) 5.9 (5.7 – 6.1)
   OPH 68.1 (67.8 – 68.4) 26.4 (26.2 – 26.6) 5.5 (5.4 – 5.6)
   LPH 55.5 (55.1 – 55.9) 39.8 (39.4 – 40.2) 4.7 (4.6 – 4.9)
   SPH 54.1 (53.8 – 54.3) 40.6 (40.3 – 40.8) 5.4 (5.2 – 5.5)
   C 49.2 (48.0 – 50.4) 39.3 (38.1 – 40.4) 11.5 (10.8 – 12.3)
  Outpatient† MTH 58.0 (57.6 – 58.4) 29.9 (29.5 – 30.2) 12.2 (11.9 – 12.4)
   OTH 52.2 (51.9 – 52.5) 31.9 (31.7 – 32.2) 15.8 (15.6 – 16.1)
   OPH 44.9 (44.6 – 45.1) 34.7 (34.5 – 35.0) 20.4 (20.2 – 20.6)
   LPH 40.4 (39.9 – 41.0) 38.7 (38.2 – 39.3) 20.8 (20.4 – 21.3)
   SPH 36.9 (36.5 – 37.3) 39.0 (38.6 – 39.3) 24.1 (23.8 – 24.4)
   C 28.6 (28.4 – 28.8) 39.6 (39.4 – 39.8) 31.8 (31.6 – 32.0)
  1. DPC: Diagnosis-procedure combination, MTH: Major teaching hospital, OTH: Other teaching hospital, OPH: Other public hospital, LPH: Large private hospital, SPH: Small private hospital, C: Clinic
  2. *DPC100070 for Type 2 Diabetes Mellitus (DM) and DPC100340 for Other DM were analysed as one category in this study.
  3. † Pearson's chi-squared test: p < 0.001 both for inpatients and outpatients
  4. ‡ Mean (Confidence interval)