Table 2 Baseline Characteristics of 97 patients

Age (years)

71.8 (8.8)

FEV1 (litre)

1.19 (0.54)

FEV1 (% predicted)

50.3 (19.7)

FVC (litre)

2.5 (0.84)

BMI (kgm^-2)

27.0 (6.0)

Pack years smoking

50.7 (34.2)

SpO₂ (%) on air

95 (2)

25-hydroxyvitamin D nmol/L

Median (IQR)

Summer

41.3 (26.8 – 64.8)

Winter

27.8 (19.4 – 44.4)

Number (%)

Male

61 (62.9)

Frequent exacerbators

28 (28.9)

Current smokers

25 (25.8)