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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Br+J+Psychiatry
2016 ; 208
(5
): 416-20
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Practising evidence-based medicine in an era of high placebo response: number
needed to treat reconsidered
#MMPMID27143006
Roose SP
; Rutherford BR
; Wall MM
; Thase ME
Br J Psychiatry
2016[May]; 208
(5
): 416-20
PMID27143006
show ga
The number needed to treat (NNT) statistic was developed to facilitate the
practice of evidence-based medicine. Placebo was assumed to be therapeutically
inert when the NNT was originally conceived, but more recent data for conditions
such as major depressive disorder (MDD) suggest that the placebo control
condition can have considerable therapeutic effects. Complications arise because
the NNT calculated from randomised controlled trials (RCTs) reflects a comparison
between medication plus clinical management and placebo plus clinical management,
whereas, in the clinical setting, physicians choose between prescribing open
medication, observing a patient over time with a supportive approach, and doing
nothing. Thus, NNTs derived from clinical trials are not directly relevant to
clinical decision-making, because they are based on control conditions that do
not exist in standard practice. Additional difficulties may arise when using NNTs
to compare alternative treatments for MDD, such as medication and psychotherapy,
since these comparisons require the control conditions upon which the respective
NNTs are based to be similar.Whereas pill placebo conditions include intensive
clinical management and elicit expectations of improvement, attention control
conditions for psychotherapy research are less well developed. Often the effects
of psychotherapy are gauged against a wait-list control condition, which has
substantially fewer therapeutic components than a pill placebo control condition.
To improve the clinical utility of NNTs for the treatment of MDD, we advocate
effectiveness studies that include treatment conditions resembling actual
clinical practice, rather than using placebo-controlled RCTs for this purpose.
Until such studies are performed, the effect of bias in comparing NNTs across
treatments can be controlled by ensuring that the RCT control conditions upon
which the NNTs are based are comparable.