From: 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
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