Measure at 6Â 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 |