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

Table 6 Empirical validity at 6 months using self-reported general health

Measure at 6 months	Categorisation of self-reported current health	N	Mean	SD	t-statistic	p-value	Relative efficiency
EQ-5D-3 L	Very Good or Good	68	0.79	0.23	6.13	P < 0.001	1.57
	Fair, Poor or Very Poor	87	0.50	0.34	6.13	P < 0.001
SF-6D	Very Good or Good	67	0.76	0.14	7.69	P < 0.001
	Fair, Poor or Very Poor	88	0.60	0.12	7.69	P < 0.001

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

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