Table 1.

Demographic characteristics of the patients (n = 78)

Age (yrs)	77.1 ± 7.5
Sex (male)	66 (84.6)
Body mass index (kg/m2)	20.71 ± 3.66
Post-bronchodilator FEV1a (L)	0.77 ± 0.37
Post-bronchodilator FVCa (L)	1.35 ± 0.55
Post-bronchodilator FEV1/FVC ratioa	0.58 ± 0.15
Post-bronchodilator FEV1% predicted normala (%)	41.50 ± 20.76
Post-bronchodilator FVC1% predicted normala (%)	51.23 ± 19.69
Pre-morbid status
Home bound	13 (16.7)
Outgoing but could only walk on level ground	28 (35.9)
Could climb up several fights of stairs	37 (47.4)
Smoking status
Never-smoker	1 (1.3)
Quitted smoking	61 (78.2)
Current smoker	16 (20.5)
Home oxygen use	20 (25.6)
On inhaled corticosteroid	42 (53.8)
On oral theophylline	29 (37.2)
Received influenza vaccination over the past 12 months	34 (43.6)
Charlson index	1.58 ± 0.88

Data are presented as mean ± SD or n (%).

^aLung function was available in 64 patients.