The specific effect of systematic exposure in irritable bowel syndrome: complier average causal effect analysis using growth mixture modeling

We reanalyzed data from a previously published randomized component study that aimed to test the incremental effect of systematic exposure in an internet-delivered cognitive behavioral treatment (ICBT) for irritable bowel syndrome (IBS). Three hundred and nine individuals with IBS were randomly assi...

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Veröffentlicht in:Psychological medicine 2017-11, Vol.47 (15), p.2653-2662
Hauptverfasser: Hesser, H., Hedman, E., Lindfors, P., Andersson, E., Ljótsson, B.
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container_end_page 2662
container_issue 15
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container_title Psychological medicine
container_volume 47
creator Hesser, H.
Hedman, E.
Lindfors, P.
Andersson, E.
Ljótsson, B.
description We reanalyzed data from a previously published randomized component study that aimed to test the incremental effect of systematic exposure in an internet-delivered cognitive behavioral treatment (ICBT) for irritable bowel syndrome (IBS). Three hundred and nine individuals with IBS were randomly assigned to either the full treatment protocol (experimental condition) or the same treatment protocol without systematic exposure (control). Participants were assessed weekly for IBS symptoms over the active treatment phase. We used a complier average causal effect (CACE) analysis, in the growth mixture modeling framework, to (1) examine the specific effect of exposure among those who received the intervention (i.e. compliers), and (2) explore the associations of pre-treatment patient characteristics with compliance status and outcome changes. Fifty-five per cent of those assigned to the experimental condition were classified as compliers. The CACE analysis that took into account compliance status demonstrated that the magnitude of the incremental effect of systematic exposure on IBS symptoms was larger than the effect observed in an intention-to-treat analysis that ignored compliance status (d = 0.81 v. d = 0.44). Patients with university education showed more improvement during the exposure phase of the treatment. Pre-treatment patient characteristics did not predict compliance status. The effect of systematic exposure on IBS symptoms is of substantial magnitude among those individuals who actually receive the intervention (CACE). Studying the subsample of individuals who discontinue treatment prematurely and tailoring interventions to improve compliance may increase overall improvement rates in ICBT for IBS.
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Med</addtitle><description>We reanalyzed data from a previously published randomized component study that aimed to test the incremental effect of systematic exposure in an internet-delivered cognitive behavioral treatment (ICBT) for irritable bowel syndrome (IBS). Three hundred and nine individuals with IBS were randomly assigned to either the full treatment protocol (experimental condition) or the same treatment protocol without systematic exposure (control). Participants were assessed weekly for IBS symptoms over the active treatment phase. We used a complier average causal effect (CACE) analysis, in the growth mixture modeling framework, to (1) examine the specific effect of exposure among those who received the intervention (i.e. compliers), and (2) explore the associations of pre-treatment patient characteristics with compliance status and outcome changes. Fifty-five per cent of those assigned to the experimental condition were classified as compliers. 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We used a complier average causal effect (CACE) analysis, in the growth mixture modeling framework, to (1) examine the specific effect of exposure among those who received the intervention (i.e. compliers), and (2) explore the associations of pre-treatment patient characteristics with compliance status and outcome changes. Fifty-five per cent of those assigned to the experimental condition were classified as compliers. The CACE analysis that took into account compliance status demonstrated that the magnitude of the incremental effect of systematic exposure on IBS symptoms was larger than the effect observed in an intention-to-treat analysis that ignored compliance status (d = 0.81 v. d = 0.44). Patients with university education showed more improvement during the exposure phase of the treatment. Pre-treatment patient characteristics did not predict compliance status. 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subjects Adherence
Adult
Behavior modification
Clinical psychology
Cognition & reasoning
Cognitive ability
Cognitive behavioral therapy
Cognitive Therapy - methods
cognitive-behavior therapy
Compliance
dismantling
Exposure
Female
Gastroenterologi
Gastroenterology
Gastroenterology and Hepatology
growth mixture modeling
Health psychology
Humans
iirritable bowel syndrome
illness representation
instrumental
internet
Intervention
Intestine
Irritable bowel syndrome
Irritable Bowel Syndrome - therapy
Male
Medicin och hälsovetenskap
metaanalysis
Middle Aged
Models, Statistical
Motivation
Neurosciences
noncompliance
Original Articles
Outcome Assessment (Health Care) - methods
Patient compliance
Patient Compliance - statistics & numerical data
Psychiatry
psychological
psychological treatment
Psykiatri
Quality of life
randomized controlled-trial
Studies
syndrome ibs
variables
visceral sensitivity
title The specific effect of systematic exposure in irritable bowel syndrome: complier average causal effect analysis using growth mixture modeling
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