Table 2.
Correlation between HAD total score and subject characteristics
| Spearman’s rho | P value | Partial correlations | P value | |
|---|---|---|---|---|
| Age |
−0.122 |
0.021 |
−0.036 |
0.509 |
| Gender† |
0.295 |
0.000 |
0.376 |
<0.001 |
| Pack-year history |
−0.029 |
0.586 |
0.051 |
0.344 |
| Duration of COPD |
0.014 |
0.799 |
−0.043 |
0.419 |
| CAT |
0.495 |
0.000 |
0.351 |
<0.001 |
| mMRC |
0.309 |
0.000 |
0.109 |
0.042 |
| BCKQ |
−0.217 |
0.000 |
−0.153 |
0.004 |
| FEV1 (L) |
−0.157 |
0.003 |
−0.063 |
0.243 |
| FEV1% predict |
−0.174 |
0.001 |
0.043 |
0.425 |
| PostFEV1 (L) |
−0.145 |
0.006 |
0.070 |
0.194 |
| PostFEV1% predict |
−0.158 |
0.003 |
−0.051 |
0.341 |
| 6MWT | −0.112 | 0.034 | 0.014 | 0.789 |
Abbreviations: CAT COPD Assessment Test, mMRC modified Medical Research Council, BCKQ Bristol COPD Knowledge Questionnaire, HAD Hospital Anxiety and Depressive Scale, FEV1 Forced Expiratory Volume in 1 Second, postFEV1 post-bronchodilator FEV1, 6MWD Six-Minute Walking Distance Test.
†Set “male” = 0, “female” = 1.