Table 3.
Correlation coefficients with corresponding Spearman’s rank (rs), statistics (S), and P values.
| No. | Studied pair of variables | rs | S | p |
|---|---|---|---|---|
| 1 | Number of BBI & 1-year FEV1 [%] | −0.67 | 3386.81 | <0.001 |
| 2 | Number of BBI & 1-year FEV1/FVC | −0.72 | 3487.04 | <0.001 |
| 3 | Number of BBI & 1-year 6MWTpost-sat [%] | −0.46 | 2963.04 | 0.026 |
| 4 | Number of BBI & 2-year FEV1 [%] | −0.41 | 169.21 | 0.273 |
| 5 | Number of BBI & 2-year FEV1/FVC | −0.49 | 179.25 | 0.177 |
| 6 | Number of BBI & 2-year 6MWT post-sat [%] | −0.75 | 210.13 | 0.02 |
| 7 | 1-year FEV1 [%] & 2-year FEV1 [%] | 0.92 | 10.0 | 0.001 |
| 8 | 1-year FEV1/FVC & 2-year FEV1/FVC | 0.92 | 10.0 | 0.001 |
| 9 | 1-year FEV1 [%] & 1-year 6MWT post-sat [%] | 0.52 | 977.7 | 0.012 |
| 10 | 1-year FEV1/FVC & 1-year 6MWTpost-sat [%] | 0.65 | 708.06 | 0.001 |
6MWT – 6-minute walk test; BBI – bronchoscopic interventions involving at least balloon bronchoplasty performed during the first year of follow-up after double lung transplantation; FEV1 – forced expiratory volume in 1 second; FEV1/FVC – Tiffeneau-Pinelli index; FVC – forced vital capacity; post-sat – oxygen saturation at the end of 6-minute walk test; pre-sat – oxygen saturation measured at the beginning of 6-minute walk test.