Table 1.

Demographics of all the subjects

	Healthy controls	COPD	COPD 1	COPD 2	COPD 3	COPD 4
n	101	133	19	49	38	27
Age (years)	65.07±14.72	71.25±11.24	79.47±8.90	72.96±10.51	71.97±10.37	61.33±8.50
Male/female	70/31	110/23	13/6	39/10	32/6	26/1
BMI (kg/m2)	24.59±3.26	23.59±4.00	23.11±3.69	25.56±3.67	23.07±3.47	21.09±3.93

Note: Data are expressed as numbers and mean ± standard deviation.

Abbreviation: BMI, body mass index.