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Table 3 Result of best models for the dependent variables UULEX, SGRQ, and 6MWD

From: Depression diagnosed by the mini international neuropsychiatric interview plus (MINI) in patients with chronic obstructive pulmonary disease: relationship with functional capacity and quality of life

Variable

Covariates

Estimate

Standard error

t statistic

p value

VIF

Adjusted R2

UULEX (# of arm elevations)

Intercept

288.95

29.68

9.73

0.000**

 

0.167

Gender (male)

39.63

17.50

2.26

0.028*

1.02

 

SGRQTOTAL

−1.17

0.50

−2.33

0.024*

1.02

 

SGRQTOTAL

Intercept

129.57

17.49

7.40

0.000**

 

0.460

Age (years)

−0.69

0.20

−3.35

0.001**

1.13

 

Monthly income (>1 minimum salary)

−11.35

3.96

−2.86

0.006**

1.18

 

Insomnia (yes)

13.37

3.70

3.61

0.000**

1.09

 

6MWD (meters)

−0.07

0.02

−3.53

0.000**

1.41

 

6MWD (meters)

Intercept

1.76E + 07

2.15E + 07

0.818

0.417

 

0.22

Gender (male)

4.37E + 07

1.22E + 07

3.577

0.000**

1.14

 

FEV1(% pred post-BD)

1.21E + 06

3.92E + 05

3.076

0.003**

1.14

 
  1. Values correspond to beta coefficients calculated at two levels of significance: * p < 0.05 and ** p < 0.01; VIF refers to multicollinearity between independent variables, for which values greater than one indicate this condition
  2. UULEX unsupported upper-limb exercise test, SGRQ TOTAL total score on Saint george’s respiratory questionnaire, 6MWD six-minute walking distance, FEV1 (% pred post-BD) % of predicted forced expiratory volume in the first second following the use of a bronchodilator