The correlation coefficients between the canonical variables of clinical objective indicators and the scores of each domain of QLICD-COPD (V2.0) in patients with chronic obstructive pulmonary disease
| Clinical objective indicator | Variable | V 1 | V 2 | Variable | U 1 | U 2 |
| TP | X1 | 0.592 | 0.277 | Y1 | 0.423 | 0.167 |
| ALB | X2 | 0.451 | −0.008 | Y2 | 0.898 | 0.324 |
| TBA | X3 | −0.129 | −0.002 | Y3 | 0.391 | 0.847 |
| ALP | X4 | −0.175 | −0.435 | Y4 | 0.780 | −0.326 |
| Scr | X5 | −0.007 | 0.120 | – | – | – |
| K | X6 | 0.032 | −0.371 | – | – | – |
| Na | X7 | 0.063 | 0.675 | – | – | – |
| NEUT% | X8 | −0.450 | −0.302 | – | – | – |
| LYMPH% | X9 | 0.456 | 0.300 | – | – | – |
| MONO% | X10 | 0.187 | 0.146 | – | – | – |
| LYMPH | X11 | −0.341 | 0.396 | – | – | – |
| MONO | X12 | −0.051 | 0.005 | – | – | – |
| HCT | X13 | −0.076 | 0.354 | – | – | – |
| PCO2 | X14 | 0.060 | 0.252 | – | – | – |
| CRP | X15 | −0.247 | −0.120 | – | – | – |
ALB, albumin; ALP, alkaline phosphatase; CRP, C-reactive protein; HCT, hematocrit; K, serum potassium; LYMPH%, percentage of lymphocytes; LYMPH, lymphocytes ; MONO, monocytes; MONO%, percentage of monocytes; Na, serum sodium; NEUT%, percentage of neutrophils; PCO2, partial pressure of carbon dioxide; QLICD-COPD V2.0, Quality of Life Instrument for Chronic Diseases-COPD (V2.0); QLICD-COPD (V2.0), Quality of Life Instrument for Chronic Diseases-COPD (V2.0); Scr, creatinine; TBA, total bile acid; TP, total protein.