From: COPD Assessment Test (CAT) score as a predictor of major depression among subjects with chronic obstructive pulmonary disease and mild hypoxemia: a case–control study
All subjects
Cases
Control group
n = 60
n = 30
p
Age, years
69.7 ± 9.0
68.8 ± 10.2
70.5 ± 7.8
0.46
Education (years)
4 (5)†
4 (1)†
4 (12)†
0.80
Socioeconomic score
17 (9)†
16 (6)†
19 (9)†
0.07