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Table 2 Clustering of prospective ED-6-month high-risk patients according to demographics and the prior year clinical histories

From: Prospective stratification of patients at risk for emergency department revisit: resource utilization and population management strategy implications

  Characteristics Cluster
  1 2 3 4 5 6
  Number of encounters 41,887 10,218 6361 4798 4231 3101
Resource utilization Average total lab test 124.75 230.98 278.51 514.73 175.55 351.06
Average total Radiology 7.39 19.41 20.05 60 17.83 38.77
Average future 6 month ED counts 2.68 2.56 4.53 4.06 4.58 2.15
Demographics Sex (Female) 55.87 52.63 72.96 57.29 72.89 47.53
Age new born 1.59 0.02 0.44 0 0.05 0
Age 1–5 4.66 0.22 0.85 0 0.38 0
Age 6–12 2.97 0.39 1.01 0 1.21 0
Age 13–18 4.25 0.82 2.56 0.02 2.65 0
Age 19–34 39.39 9.89 35.97 5.79 47.67 0.35
Age 35–49 21.75 19.5 30.26 18.92 32.95 5.61
Age 50–65 13.73 28.49 19.64 35.16 11.65 16.48
Age >65 11.65 40.67 9.28 40.1 3.45 77.56
Chronic disease conditions Total Chronic disease conditions 1.87 6.35 6.42 15.26 4.34 12.2
Percentage of encounters without chronic diseases 24.8 0 0 0 0 0
Other hematologic conditions 0.07 0.15 0.09 0.13 0.05 0.06
Cancer of pancreas 0.03 0.14 0.02 0.25 0.07 0.23
Pulmonary heart disease 0.07 0.03 0.09 0.06 0.05 0.03
Transient cerebral ischemia 0.06 0.06 0.06 0 0.02 0
Diabetes mellitus with complications 0.05 0.02 0.03 0 0 0.06
Systemic lupus erythematous & connective tissue disorders 0.05 0.04 0.02 0 0.02 0
Disorders of lipid metabolism 0.04 0.05 0 0 0.02 0.06
Anxiety disorders 0.03 0.06 0.02 0.06 0 0
Genitourinary symptoms and ill defined conditions 0.02 0.03 0.02 0.04 0 0.03
Epilepsy convulsions 0.01 0.01 0.02 0.08 0 0.06
Hyperplasia of prostate 0.03 0 0.02 0 0 0
Immunity disorders 0.03 0 0.02 0 0 0
Other complications of pregnancy 0.01 0.01 0.02 0.06 0.02 0.03
Other diseases of bladder and urethra 0.01 0.01 0.02 0.06 0.02 0.03
Cancer of kidney and renal pelvis 0.02 0.01 0.03 0.02 0.02 0
Open wounds of extremities 0.02 0 0.02 0 0.02 0
Other non epithelial cancer of skin 0 0.01 0.05 0 0.02 0.06
Other nutritional endocrine and metabolic disorders 0 0.01 0.05 0 0.02 0.06
Cancer other and unspecified primary 0.02 0 0 0 0.02 0
Biliary tract disease 0.01 0.02 0 0 0 0.03
  1. Characteristics of resource utilization, demographics and chronic disease conditions were summarized for each cluster. All the data shown within the headers of demographics and chronic disease conditions were expressed in percentages (%)