From: Correlations between disease-specific and generic health status questionnaires in patients with advanced COPD: a one-year observational study
Baseline
4 months
8 months
12 months
EQ-5D index score
−0.536
−0.439
−0.487
−0.421
AQoL total score
−0.617
−0.547
−0.587
−0.496
SF-36, PCS score
−0.679
−0.469
−0.464
−0.559
SF-36, MCS score
−0.489
−0.296
−0.314
−0.285