Fig 1.
PRISMA flow-diagram of studies.
Abbreviations and symbols: k = number of studies, n = number of study participants, OC = outcome, SS = Somatic Symptoms, HRQOL = Health Related Quality Of Life, FI = Functional Interference, CAT = Catastrophizing, DEP = Depression.
Fig 2.
Numbers of studies in which behavioral change techniques were identified by comparison.
Table 1.
Risk of bias assessment by the 7 key categories of the Cochrane risk of bias tool.
Table 2.
Overview of meta-analyses results for direct effects based on all eligible studies with relevant data.
Fig 3.
Funnel plot for symptom severity scores post treatment by various patient conditions.
SE = Standard Error, SMD = Standardized Mean Difference.
Fig 4.
Funnel plot for symptom severity scores post treatment by various types of control groups.
SE = Standard Error, SMD = Standardized Mean Difference. Comments: The meta-analysis presented here included the results for active comparisons (not the passive ones) from Trompetter et al. (2015) and Dear et al. (2015) to avoid double entries. Online discussion was facilitated for control group participants while being on a waiting list for receiving the experimental CBI.