Table 3.

Differences in physical activity (steps per day) and fatigue (CFQ score) between SEID-positive and SEID-negative patients 30 weeks after inclusion

Variables	SEID-positive, mean	SEID-negative, mean	Difference*	P value*
Steps per day, number
Baseline	4342	4823
Week 30	4667	4518	−498	0.326
CFQ total sum score
Baseline	20.7	18.1
Week 30	19.0	20.4	1.86	0.413

*Based on analysis of covariance models in which differences and P values are adjusted for baseline values of outcome variables as well as allocation to clonidine/placebo during the first 8 weeks of the trial.

CFQ, Chalder Fatigue Questionnaire; SEID, systemic exertion intolerance disease.