Frequency of high fatigue. Percentage of patients with high fatigue level, N = 122. A high fatigue level defined as mean fatigue severity scale (FSS) score > 4 was experienced by 70.7% at baseline and 72.1% at follow-up (P = 0.86, McNemar's test). Using an FSS value of 5 as cut-off, the frequencies were 47.9% and 57.4%, respectively (P = 0.08, McNemar's test).
Haldorsen et al. Arthritis Research & Therapy 2011 13:R167 doi:10.1186/ar3487