Physical activity measures in patients with myalgic encephalomyelitis/chronic fatigue syndrome: correlations between peak oxygen consumption, the physical functioning scale of the SF-36 questionnaire, and the number of steps from an activity meter

Table 2 Subgroup analysis of ME/CFS patients with and without a RER ≥ 1.1

	RER ≥ 1.1	RER < 1.1	P-value
Number/percentage	53 (54%)	46 (46%)
Number of steps/day (median/IQR)	4683 (3350–7932)	4779 (3352–7279)	0.30
SF-36 Physical activity	49 (20)	38 (22)	0.03
%peak VO₂	78 (18)	71 (18)	0.09

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