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Table 2 EQ-5D health utility scores at end-of-trial stratified by Seattle Angina Questionnaire Angina Frequency Classification based upon mapping equations 1 and 2

From: Impact of angina frequency on health utility values of patients with chronic stable angina

   Mapping Equation 1# Mapping Equation 2†
SAQAF domain score N Median EQ-5D score 25%, 75% range P-Value* Median EQ-5D score 25%, 75% range P-Value*
Overall 548 0.75 0.69, 0.80 NA 0.68 0.62, 0.77 NA
No (100) 28 0.89 0.84, 0.92 Referent 0.87 0.77, 0.91 Referent
Monthly (61–99) 188 0.80 0.75, 0.85 <0.001 0.76 0.70, 0.81 <0.001
Weekly (31–60) 283 0.72 0.68, 0.76 <0.001 0.65 0.61, 0.70 <0.001
Daily (0–30) 49 0.65 0.61, 0.69 <0.001 0.54 0.52, 0.61 <0.001
  1. EQ-5D = EuroQol 5-Dimension; N = number of patients; SAQAF = Seattle Angina Questionnaire Angina frequency.
  2. *p < 0.001 for the overall association using a Kruskal-Wallis one-way analysis of variance test; p-values for angina frequency domain score comparisons to “no” angina (referent) using Mann–Whitney U test.
  3. #Mapping Equation 1 = Wijeysundera 2011 [15].
  4. †Mapping Equation 2 = Goldsmith 2010 [16].
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