Table 2 Selected predictors and their regression coefficients

From: Prediction of COPD-specific health-related quality of life in primary care COPD patients: a prospective cohort study

Selected predictors

Scale

6 Months

24 Months

CRQ dyspnoea

 CRQ dyspnoea

1–7

0.6644

0.6559

 CRQ fatigue

1–7

0.0759

 

 Lung function (FEV1% of predicted)

Continuous

0.0046

 

 Feeling thermometer

0–100

0.0042

0.0008

 Pulmonary medication

Dichotomous

−0.0115

 

CRQ fatigue

 CRQ fatigue

1–7

0.6299

0.5212

 HADS depression score

0–21

−0.0270

−0.0241

 CRQ emotional

1–7

0.0115

 

 CRQ dyspnoea

1–7

0.0039

0.1057

 Feeling thermometer

0–100

0.0008

 

 Country

Dichotomous

 

0.0472

CRQ emotional function

 CRQ emotional function

1–7

0.5593

0.6105

 HADS depression score

0–21

−0.0569

−0.0136

 CRQ dyspnoea

1–7

0.0498

 

 CRQ fatigue

1–7

0.0439

0.0049

 Self-efficacy 2 a

1–5

0.0098

 

CRQ mastery

 CRQ mastery

1–7

0.4284

0.3692

 CRQ fatigue

1–7

0.0939

0.0156

 CRQ dyspnoea

1–7

0.0605

0.0545

 HADS depression score

0–21

−0.0165

−0.0082

 Self-efficacy 2 a

1–5

0.0350

 

 CRQ emotional

1–7

 

0.1045

CRQ total score

 CRQ fatigue

1–7

0.2444

0.1664

 CRQ dyspnoea

1–7

0.2397

0.2553

 HADS depression score

0–21

−0.0364

−0.0221

 CRQ mastery

1–7

0.0264

 

 Self-efficacy 2 a

1–5

0.0388

 

 CRQ emotional function

1–7

0.1187

0.1772

 Physical activity score (LAPAQ)

0–7

0.0184

 
  1. Abbreviations: CRQ, chronic respiratory questionnaire; FEV1, forced expiratory volume in 1 s; HADS, Hospital Anxiety and Depression Scale, LAPAQ, LASA (Longitudinal Ageing Study Amsterdam) Physical Activity Questionnaire.
  2. aSelf-efficacy 2 pertained to the following question: ’How confident were you during the past 2 weeks that you were in control of your breathlessness, so the breathlessness did not hold you back from the things you wanted to do?’.
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