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Table representation of search results timeline featuring number of search results per year.

Year Number of Results
1998 1
1999 3
2000 2
2001 16
2002 3
2003 5
2004 5
2005 5
2006 5
2007 10
2008 8
2009 2
2010 12
2011 13
2012 10
2013 10
2014 18
2015 18
2016 18
2017 25
2018 31
2019 27
2020 18
2021 3
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235 results
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Page 1
The Placebo and Nocebo effect on sports performance: A systematic review.
Hurst P, Schipof-Godart L, Szabo A, Raglin J, Hettinga F, Roelands B, Lane A, Foad A, Coleman D, Beedie C. Hurst P, et al. Eur J Sport Sci. 2020 Apr;20(3):279-292. doi: 10.1080/17461391.2019.1655098. Epub 2019 Aug 20. Eur J Sport Sci. 2020. PMID: 31414966
Small to moderate placebo effects were found for both placebo (d = 0.36) and nocebo (d = 0.37) effects and when separated by nutritional (d = 0.35) and mechanical (d = 0.47) ergogenic aids. The pooled effect size revealed a small to moderate effect size across all s …
Small to moderate placebo effects were found for both placebo (d = 0.36) and nocebo (d = 0.37) effects and when separated by nutritional (d …
Vitamin D and gestational diabetes mellitus: a systematic review based on data free of Hawthorne effect.
Zhang Y, Gong Y, Xue H, Xiong J, Cheng G. Zhang Y, et al. BJOG. 2018 Jun;125(7):784-793. doi: 10.1111/1471-0528.15060. Epub 2018 Jan 18. BJOG. 2018. PMID: 29244241
SELECTION CRITERIA: Observational studies on the relationship between vitamin D and GDM free from Hawthorne effect and randomised controlled trials of vitamin D supplementation during pregnancy for preventing or treating GDM were included. ...
SELECTION CRITERIA: Observational studies on the relationship between vitamin D and GDM free from Hawthorne effect and randomi …
Systematic review of the Hawthorne effect: new concepts are needed to study research participation effects.
McCambridge J, Witton J, Elbourne DR. McCambridge J, et al. J Clin Epidemiol. 2014 Mar;67(3):267-77. doi: 10.1016/j.jclinepi.2013.08.015. Epub 2013 Nov 22. J Clin Epidemiol. 2014. PMID: 24275499 Free PMC article. Review.
OBJECTIVES: This study aims to (1) elucidate whether the Hawthorne effect exists, (2) explore under what conditions, and (3) estimate the size of any such effect. STUDY DESIGN AND SETTING: This systematic review summarizes and evaluates the strength of availa …
OBJECTIVES: This study aims to (1) elucidate whether the Hawthorne effect exists, (2) explore under what conditions, and (3) e …
Placebo effect of acupuncture on insomnia: a systematic review and meta-analysis.
Liu C, Xi H, Wu W, Wang X, Qin S, Zhao Y, Zheng S, Wan Q, Xu L. Liu C, et al. Ann Palliat Med. 2020 Jan;9(1):19-29. doi: 10.21037/apm.2019.11.15. Ann Palliat Med. 2020. PMID: 32005059 Free article.
As the underlying mechanism is yet unclear, its efficacy is often considered as placebo effect. To clarify whether acupuncture treatment of insomnia is only due to its placebo effect, a systematic review and a meta-analysis were designed based on the comparison betw …
As the underlying mechanism is yet unclear, its efficacy is often considered as placebo effect. To clarify whether acupuncture treatm …
Nonoperative Treatments for Knee Osteoarthritis: An Evaluation of Treatment Characteristics and the Intra-Articular Placebo Effect: A Systematic Review.
Vannabouathong C, Bhandari M, Bedi A, Khanna V, Yung P, Shetty V, Khan M. Vannabouathong C, et al. JBJS Rev. 2018 Jul;6(7):e5. doi: 10.2106/JBJS.RVW.17.00167. JBJS Rev. 2018. PMID: 30020117
Much of this controversy relates to what constitutes a clinically important effect. The purposes of the present study were to compare treatment effect sizes from recent meta-analyses evaluating pharmacological or medical device interventions for the treatment of kne …
Much of this controversy relates to what constitutes a clinically important effect. The purposes of the present study were to compare …
Antipsychotics for treatment of delirium in hospitalised non-ICU patients.
Burry L, Mehta S, Perreault MM, Luxenberg JS, Siddiqi N, Hutton B, Fergusson DA, Bell C, Rose L. Burry L, et al. Cochrane Database Syst Rev. 2018 Jun 18;6(6):CD005594. doi: 10.1002/14651858.CD005594.pub3. Cochrane Database Syst Rev. 2018. PMID: 29920656 Free PMC article. Review.
We used risk ratios (RR) with 95% confidence intervals (CI) as a measure of treatment effect for dichotomous outcomes, and between-group standardised mean differences (SMD) with 95% CI for continuous outcomes. ...
We used risk ratios (RR) with 95% confidence intervals (CI) as a measure of treatment effect for dichotomous outcomes, and between-gr …
Ferrous sulfate supplementation causes significant gastrointestinal side-effects in adults: a systematic review and meta-analysis.
Tolkien Z, Stecher L, Mander AP, Pereira DI, Powell JJ. Tolkien Z, et al. PLoS One. 2015 Feb 20;10(2):e0117383. doi: 10.1371/journal.pone.0117383. eCollection 2015. PLoS One. 2015. PMID: 25700159 Free PMC article. Review.
Ferrous sulfate supplementation significantly increased risk of GI side-effects versus placebo with an odds ratio (OR) of 2.32 [95% CI 1.74-3.08, p<0.0001, I2 = 53.6%] and versus i.v. iron with an OR of 3.05 [95% CI 2.07-4.48, p<0.0001, I2 = 41.6%]. Subgroup analysis in IBD …
Ferrous sulfate supplementation significantly increased risk of GI side-effects versus placebo with an odds ratio (OR) of 2.32 [95% CI 1.74- …
Hawthorne effect on surgical studies.
Demetriou C, Hu L, Smith TO, Hing CB. Demetriou C, et al. ANZ J Surg. 2019 Dec;89(12):1567-1576. doi: 10.1111/ans.15475. Epub 2019 Oct 16. ANZ J Surg. 2019. PMID: 31621178
BACKGROUND: The Hawthorne effect or 'observer effect' describes a change in normal behaviour when individuals are aware they are being observed. ...Six (37%) observational studies were identified with the aim of measuring the Hawthorne effect on …
BACKGROUND: The Hawthorne effect or 'observer effect' describes a change in normal behaviour when individuals are aware …
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