Table 3.
Correlations among Measurements of Constructs including Dyspnea, Anxiety, Depression, Fatigue, and Physical Performance
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dyspnea | |||||||||||||||
| 1 CRQ-D | 1.00 | ||||||||||||||
| 2 UCSD-SOB | .83*** | 1.00 | |||||||||||||
| 3 mMRC | .55*** | .60*** | 1.00 | ||||||||||||
| Anxiety | |||||||||||||||
| 4 HADS-A | .37*** | .23*** | .07 | 1.00 | |||||||||||
| 5 SF36-MH1 | .32*** | .25*** | .08 | .52*** | 1.00 | ||||||||||
| 6 CRQ-EF4 | .44*** | .32*** | .16** | .55*** | .51*** | 1.00 | |||||||||
| 7 CRQ-EF7 | .45*** | .35*** | .14* | .64*** | .52*** | .70*** | 1.00 | ||||||||
| Depression | |||||||||||||||
| 8 HADS-D | .35*** | .29*** | .18** | .63*** | .38*** | .53*** | .50*** | 1.00 | |||||||
| 9 PHQ-9 | .43*** | .36*** | .21** | .63*** | .40*** | .58*** | .63*** | .73*** | 1.00 | ||||||
| Fatigue | |||||||||||||||
| 10 SF36-V | .37*** | .40*** | .26*** | .21** | .18** | .41*** | .40*** | .39*** | .40*** | 1.00 | |||||
| 11 CRQ-F | .53*** | .48*** | .26*** | .41*** | .34*** | .56*** | .60*** | .51*** | .63*** | .60*** | 1.00 | ||||
| Physical Performance | |||||||||||||||
| 12 6MWT | −.41*** | −.44*** | −.45*** | .03 | −.04 | −.05 | −.02 | −.11 | −.10 | −.15* | −.18** | 1.00 | |||
| 13 Daily Total Steps | −.32*** | −.37*** | −.42*** | .13* | .03 | .00 | .01 | −.09 | −.09 | −.20** | −.14* | .55*** | 1.00 | ||
| 14 SF36-RP | −.54*** | −.49*** | −.34*** | −.24*** | −.25*** | −.34*** | −.33*** | −.35*** | −.38*** | −.34*** | −.52*** | .26*** | .29*** | 1.00 | |
| 15 SF36-PF | −.72*** | −.78*** | −.61*** | −.14* | −.22** | −.28*** | −.25*** | −.28*** | −.31*** | −.42*** | −.43*** | .52*** | .48*** | .58*** | 1.00 |
Note. CRQ-D = Chronic Respiratory Questionnaire - Dyspnea subscale; UCSD-SOB = University of California, San Diego Shortness of Breath Questionnaire; mMRC = the modified Medical Research Council dyspnea score; HADS-A = the Hospital Anxiety and Depression Scale - Anxiety; SF36-MH1 = the Medical Outcomes Study Short Form-36 - Mental Health subscale question 1; CRQ-EF4 = Chronic Respiratory Questionnaire - Emotional Function subscale question 4; CRQ-EF7 = Chronic Respiratory Questionnaire - Emotional Function subscale question 7; HADS-D = the Hospital Anxiety and Depression Scale - Depression; PHQ-9 = the Patient Health Questionnaire-9; SF36-V = the Medical Outcomes Study Short Form-36 - Vitality subscale; CRQ-F = Chronic Respiratory Questionnaire - Fatigue subscale; 6MWT = the six minute walk test; SF36-RP = the Medical Outcomes Study Short Form-36 - Role Physical subscale; SF36-PF = the Medical Outcomes Study Short Form-36 - Physical Functioning subscale.
p < .05,
p < .01,
p < .001