Table 2.

Physical activity in the study subjects

	Control	COPD
		GOLD I/II	GOLD III/IV
Subjects, n	18	37	33
Number of steps per day	6,844 (4,935–7,832)	5,460 (2,527–7,840)	1,744 (716–4,543)**,‡
Duration of ≥2.0 METs, min/day	177 (143–254)	162 (92–225)	83 (58–157)*,‡
Duration of ≥2.5 METs, min/day	84 (63–143)	71 (35–95)	27 (11–62)**,‡
Duration of ≥3.0 METs, min/day	37 (25–51)	25 (12–43)	8 (3–19)**,‡

Notes: Data are presented as median (IQR).

^*p < 0.01,

^**p < 0.001 versus control,

^‡p < 0.01 versus GOLD I/II.

Abbreviations: GOLD, Global Initiative for Chronic Obstructive Lung Disease; METs, metabolic equivalents; IQR, interquartile range.