1. Perioperative psychotherapy for persistent post-surgical pain and physical impairment: a meta-analysis of randomised trials 
L. Wang, Y. Chang, S.A. Kennedy, P.J. Hong, N. Chow, R.J. Couban, R.E. McCabe, P.J. Bieling, J.W. Busse 
British Journal of Anaesthesia 
Volume 120, Issue 6, Pages (June 2018)
DOI: /j.bja
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2. Fig 1
PRISMA flow diagram of study selection. *CDSR, Cochrane Database of Systematic Reviews; †CENTRAL, Cochrane Central Register of Controlled Trials.
British Journal of Anaesthesia  , DOI: ( /j.bja )
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3. Fig 2
Mean difference in persistent post-surgical pain reduction when treated with perioperative psychotherapy compared with usual care, by type of therapy. All instruments transformed to a 0–10 cm visual analogue scale. Interaction P=0.01. *Psychological support.
British Journal of Anaesthesia  , DOI: ( /j.bja )
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4. Fig 3
Mean difference in functional impairment reduction when treated with perioperative psychotherapy compared with usual care, by type of therapy. All instruments transformed to a 0–100% Oswestry Disability Index. Interaction P=0.01. *Heterogeneity associated with the pooled effect of active psychotherapy is largely introduced by the extremely precise result of one trial (Cheung and colleagues22), and when removed the I2=38.9% and P=0.15. Contact with the author, however, confirmed accuracy of the reported data.
British Journal of Anaesthesia  , DOI: ( /j.bja )
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