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Table 2 Observed, purified and theoretical estimates of health utility for the 20 most prevalent co-morbid conditions (descending) in cycle 1.1 of CCHS

From: Deriving utility scores for co-morbid conditions: a test of the multiplicative model for combining individual condition scores

Two conditions reported together on CCHS   ObservedΦ HUI3 Purified HUI3 Theoretical utility
Non-Food Allergies Asthma 0.93 (0.01) 1.00 (0.01) 0.98 (0.01)
Non-Food Allergies Back Problems* 0.86 (0.01) 0.92 (0.01) 0.94 (0.01)
Food Allergies Non-Food Allergies 0.92 (0.01) 0.99 (0.01) 0.99 (0.01)
Arthritis/Rheumatism Back Problems* 0.78 (0.01) 0.83 (0.01) 0.88 (0.01)
Non-Food Allergies Migraine Headaches 0.91 (0.01) 0.98 (0.01) 0.97 (0.01)
Arthritis/Rheumatism High Blood Pressure 0.85 (0.01) 0.91 (0.01) 0.93 (0.01)
Non-Food Allergies Arthritis/Rheumatism 0.83 (0.02) 0.89 (0.02) 0.94 (0.01)
Back Problems* Migraine Headaches 0.82 (0.01) 0.88 (0.01) 0.91 (0.01)
Non-Food Allergies High Blood Pressure 0.92 (0.01) 0.98 (0.01) 0.98 (0.01)
Back Problems* High Blood Pressure 0.86 (0.02) 0.92 (0.02) 0.92 (0.01)
High Blood Pressure Diabetes 0.89 (0.02) 0.96 (0.02) 0.96 (0.01)
Non-Food Allergies Thyroid Condition 0.92 (0.01) 0.99 (0.01) 1.00 (0.01)
High Blood Pressure Heart Disease 0.91 (0.02) 0.97 (0.02) 0.95 (0.01)
Arthritis/Rheumatism Migraine Headaches 0.84 (0.02) 0.90 (0.02) 0.91 (0.01)
Food Allergies Back Problems* 0.88 (0.01) 0.94 (0.01) 0.93 (0.01)
Asthma Back Problems* 0.87 (0.02) 0.93 (0.02) 0.92 (0.01)
High Blood Pressure Migraine Headaches 0.84 (0.02) 0.90 (0.02) 0.95 (0.01)
Food Allergies Asthma 0.92 (0.01) 0.98 (0.02) 0.97 (0.01)
Arthritis/Rheumatism Thyroid Condition 0.90 (0.02) 0.96 (0.02) 0.94 (0.01)
Food Allergies Migraine Headaches 0.91 (0.01) 0.98 (0.02) 0.96 (0.01)
  1. Notes:
  2. Standard error is shown in brackets following the estimate.
  3. Conditions are shown in descending order of prevalence of the observed co-morbidity.
  4. * Back problems excluding fibromyalgia & arthritis.
  5. Φ Observed refers to the average, age-sex standardized HUI3 of the pair of conditions reported together on CCHS before being purified.
  6. Purified refers to the average observed utility after division by the average utility of those reporting no conditions.
  7. Theoretical refers to the utility estimated from the multiplicative rule (no synergy), using the purified HUI3 of the two conditions reported alone (Table 1).