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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