Table 1

COPD cohort patient characteristics

All patients (113)Iron deficient (20)Iron replete (81)Statistical comparison
Male sex; n (%)74 (65)12 (60)53 (66)χ2 (p=0.793)
Age, years; mean (SD)67.6 (8.77)67.5 (9.86)67.5 (8.47)t test (p=0.980)
FEV1, % predicted; mean (SD)43.8 (17.1)39.7 (16.5)44.8 (17.0)t test (p=0.236)
Current smoker; n (%)17 (15)4 (20)11 (13.6)χ2 (p=0.710)
Pack years; median (IQR)44.0 (28.5–62.0)44.0 (37.0–67.0)45.0 (27.8–62.8)MWU test (p=0.799)
BMI, kg/m2; median (IQR)27.6 (21.7–30.3)27.8 (21.6–31.9)27.5 (21.7–30.6)MWU test (p=0.855)
Long-term oxygen therapy; n (%)5 (4)2 (10)3 (4)χ2 (p=0.531)
Any home oxygen therapy; n (%)14 (12)5 (25)8 (10)χ2 (p=0.151)
  • BMI, body mass index; COPD, chronic obstructive pulmonary disease; FEV, forced expiratory volume in 1 s; MWU, Mann-Whitney U.