Are treatments more effective than placebos? A systematic review and meta-analysis

J Howick, C Friedemann, M Tsakok, R Watson… - PloS one, 2013 - journals.plos.org
… A final limitation is that the heterogeneity of treatments, placebos, and ‘no treatments’ …
placebo treatments in our studies included placebo injections, placebo acupuncture, and placebo

Is the placebo powerless? An analysis of clinical trials comparing placebo with no treatment

A Hróbjartsson, PC Gøtzsche - New England Journal of Medicine, 2001 - Mass Medical Soc
… To understand better the effects of placebo as a treatment, we conducted a … to placebo or
to no treatment. We were primarily interested in the clinical effect of placebo as a treatment for …

The placebo effect and its determinants in osteoarthritis: meta-analysis of randomised controlled trials

W Zhang, J Robertson, AC Jones, PA Dieppe… - Annals of the …, 2008 - ard.bmj.com
placebo treatment and non-treatment (observation only) in those RCTs that included active,
placebo and untreated groups showed that placebo (… positive effect from placebo. This result …

A systematic review and meta-analysis of placebo versus no treatment for insomnia symptoms

V Yeung, L Sharpe, N Glozier, ML Hackett… - Sleep medicine …, 2018 - Elsevier
… We meta-analysed the effect size for placebo treatment versus no treatment on each sleep
… All analyses were run using a random effects model, which is appropriate when including …

Nocebo is the enemy, not placebo. A meta-analysis of reported side effects after placebo treatment in headaches

DD Mitsikostas, LI Mantonakis, NG Chalarakis - Cephalalgia, 2011 - journals.sagepub.com
… in these trials, we calculated the percentage of patients treated with placebo who reported
at … of several recent meta-analyses of nocebo. In the meta-analysis of Amanzion et al. (18), …

Magnitude of the placebo response across treatment modalities used for treatment-resistant depression in adults: a systematic review and meta-analysis

BDM Jones, LB Razza, CR Weissman, J Karbi… - JAMA network …, 2021 - jamanetwork.com
… In this meta-analysis, we report on the placebo effect in TRD across multiple treatment
participants who received either pill placebo, parenteral placebo, liquid placebo, sham rTMS, …

Effectiveness and implications of alternative placebo treatments: a systematic review and network meta-analysis of osteoarthritis trials

RR Bannuru, TE McAlindon, MC Sullivan… - Annals of internal …, 2015 - acpjournals.org
placebo effects on apparent treatment effects, we evaluated 1 other network meta-analysis
model (nondifferential combined placebo … This model assumed that all 4 placebos had the …

The placebo response in the treatment of chronic fatigue syndrome: a systematic review and meta-analysis

HJ Cho, M Hotopf, S Wessely - Psychosomatic Medicine, 2005 - journals.lww.com
placebo effect in clinical trials, we used the term placebo response, operationally defined as
the proportion of responders in a placebo … the placebo response in the treatment of CFS to …

Are the clinical effects of homoeopathy placebo effects? A meta-analysis of placebo-controlled trials

K Linde, N Clausius, G Ramirez, D Melchart, F Eitel… - The Lancet, 1997 - thelancet.com
… 15 trials used continuous rather than discrete outcomes and provided the placebo and
treatment groups' means and standard deviations on these outcomes. For these trials the …

Metaanalysis: the effects of placebo treatment on gastro‐oesophageal reflux disease

F Cremonini, DC Ziogas, HY Chang… - Alimentary …, 2010 - Wiley Online Library
… However, the placebo response rates reported in clinical trials vary considerably. The
aims of this meta-analysis were to determine the magnitude of the placebo response rate in …