Internet-based CBT for adolescents with chronic fatigue syndrome

摘要

Three of the four thresholds used by Sanne Nijhof and colleagues (April 14, p 1412) for their post-hoc definition of recovery from chronic fatigue syndrome are virtually the same as the entry criteria. For example, 40 or more on the fatigue severity subscale of the checklist individual strength 20 (CIS-20) was equivalent to "severe fatigue" at baseline, yet once a participant scored less than 40 (the mean +2 SDs for a healthy population) they could be counted as recovered! The face validity of their other post-hoc recovery definition, listed in the appendix, seems stronger, but it gives a much lower figure for recovery of 36% (rather than 63%).