Table 1. Biometric characteristics data for the subjects included in the study.

-	COPD-GOLD II	COPD-GOLD III	COPD-GOLD IV
# Patients	18	15	10
Age (yrs)	71 ±9.4	77±5.7	68±3.5
Height (m)	1.62±0.07	1.7 ±0.087	1.66 ±0.035
Weight (kg)	70.4 ±10.59	78.5 ±10.66	75.4 ±13.64