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Table 4 Sensitivity, specificity, positive- and negative predicitive value (%) for detecting use of polypharmacy (4 or more regular prescription medicines) according to resource utilisation band (RUB).

From: Validating the Johns Hopkins ACG Case-Mix System of the elderly in Swedish primary health care

  model A model B model C model D model E
Sensitivity 31.9 33.6 38.4 46.3 41.2
Specificity 88.5 89.2 89.8 90.1 90.2
Positive predicitive value 55.4 58.3 62.7 67.8 65.5
Negative predicitive value 74.4 75.0 76.5 78.9 77.4
Correctly classified 71.0 72.0 73.9 76.6 75.1
Area under ROC curve 0.72 (0.69–0.75)a 0.73 (0.70–0.76) 0.76 (0.73–0.79) 0.80 (0.77–0.82) 0.77 (0.74–0.80)
Goodness-of-fit 0.90 0.39 0.64 0.31 0.01
  1. a 95% confidence interval
  2. model A: adjusted for age
  3. model B: adjusted for sex and age
  4. model C: adjusted for sex, age, level of education and IADL function
  5. model D: adjusted for sex, age, level of education, IADL function, SCB and Ware
  6. model E: model D excluding RUB