This is ridiculous, the more I look at it the more it's full of holes. They say 31% loss to follow up. That may be true overall, in that maybe 31% gave no follow up information, but:
CFQ 48.5% not followed up.
SF36 47.4% not followed up.
Can I ask a dumb question? If there is such a huge dropout how can they get away with such blatant lies in the results section of the Abstract?
Results
Patients fatigue, physical functioning and social adjustment scores significantly improved over the duration of treatment with medium to large effect sizes (|d|=0.45 – 0.91). Furthermore 85% of patients self-reported that they felt an improvement in their fatigue at follow-up and 90% were satisfied with their treatment. None of the regression models convincingly predicted improvement in outcomes with the best model being (R2 =0.137).
If only 52% of patients were followed up, how can 90% of them be satisfied at follow-up?
Ahh found it. They made up the results to get the follow-up numbers in the results section
[EDIT - the following quite only applies to "Predictors of outcome" section which showed there were no predictors]
For those patients without end of treatment scores, the nearest follow-up score was used to compute an end point and was defined as a computed follow-up score.
Okay. Let's look into drop out some more. Note - , the study goes back to 2002!!! Notice they say a 31% dropout.
Drop-out was defined as those patients who did not complete any questionnaires at the end of treatment, or any follow-up and was 31% in this naturalistic setting. Reason for drop-out was only recorded since 2007 and therefore we have no data from 2002 to 2007.
But as
@Trish highlighted about 48% of patients were not followed-up in any one of the questionaires.
So let me summarise.
1. Reading the abstract, data was available for 995 patients and 85% felt the treatment showed an improvement. That sounds good.
2. Quick look at the meat and potatoes
- They used Oxford and CDC criteria that don't required PEM a key no-no in any modern CFS paper, and even then only 754 (76%) participants met Oxford criteria for CFS and 518 (52%) met CDC criteria for CFS. So even the loosest of critera only about 50% of those starting CBT actually had CFS
- 48% dropped out of answering some questionnaires, but only 31% dropped out of answering all questionnaires,
- They "made up the answers" for dropouts which was about half the participant number and then presented final results as if all had participated.
Do they even discuss how the CBT treatment changed over those 14 years and what versions of questionnaires were used when?
Okay, I know I repeated others statements, but I had to verify them for myself as they are quite outrageous. It's the abstract and analysis in the paper that is outrageous.
EDIT : I'm surprised that they didn't present a subsection of analysis on only patients that met the CDC criteria? That implies that the results for that are not as stunning!