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Table 7 Empirical validity at 6 months using self-reported respiratory health

From: Psychometric properties of Patient Reported Outcome Measures (PROMs) in patients diagnosed with Acute Respiratory Distress Syndrome (ARDS)

Measure at 6 months Categorisation of self-reported respiratory health. N Mean SD t-statistic p-value Relative efficiency
EQ-5D-3 L Q1 or Q2 90 0.69 0.31 4.14 P < 0.001 1.56
  Q3, Q4 or Q5 33 0.43 0.30
SF-6D Q1 or Q2 90 0.70 0.13 5.18 P < 0.001
  Q3, Q4 or Q5 32 0.56 0.10
  1. N is the sample size. SD denotes the standard deviation. Relative efficiency statistic is referenced at 1.0 for the EQ-5D-3 L. A relative efficiency value higher than 1.0 shows that the SF-6D is more efficient than the EQ-5D-3 L