Median regression coefficients (with 95% CI and p value) for IMD quintile relative to the reference group of least deprived quintile, in the percentage change of ISWT/6MWT exercise test distances for 3901 patients
| IMD quintile | Unadjusted coefficient (95% CI) | After adjusting for baseline ISWT/6MWT exercise score quartile and PR programme clustering effects | After adjusting for table 1 variables*, baseline ISWT/6MWT exercise score quartile and PR programme clustering effects |
|---|---|---|---|
| Q1 most deprived | 5.43 (1.56 to 9.30), p=0.006 | 2.17 (−1.48 to 5.83), p=0.24 | −0.03 (−4.10 to 4.04), p=0.99 |
| Q2 | 6.70 (2.76 to 10.6), p=0.001 | 4.55 (1.03 to 8.07), p=0.01 | 3.43 (−0.71 to 7.58), p=0.10 |
| Q3 | 1.20 (-2.69 to 5.09), p=0.55 | 0.07 (−3.72 to 3.86), p=0.97 | −1.00 (−5.31 to 3.32), p=0.65 |
| Q4 | 1.20 (-2.81 to 5.21), p=0.56 | 0.07 (−3.70 to 3.83), p=0.97 | −0.26 (−4.20 to 3.67), p=0.90 |
| Q5 least deprived | Reference coefficient=0.00 | Reference coefficient=0.00 | Reference coefficient=0.00 |
| Not known | 0.35 (−8.66 to 9.36), p=0.94 | 2.17 (−3.54 to 7.88), p=0.46 | 2.62 (−3.89 to 9.13), p=0.43 |
Note about coefficients: these estimate the difference in the median (percentage change) in the regression equation with respect to IMD quintile. In the last two columns this is after other variables have been fixed (adjusted for) in the regression equation.
*Gender, age group, smoking status, mental health disorder comorbidity, patients living arrangements and patient-reported MRC dyspnoea score at initial assessment.
6MWT, 6 min walk test; IMD, Index of Multiple Deprivation; IPR, pulmonary rehabilitation; MRC, Medical Research Council; SWT, Incremental Shuttle Walk test.