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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