Journal article: Citation bias in reported smoking prevalence in people with schizophrenia

Ragg & Co > Favourite projects > Journal article: Citation bias in reported smoking prevalence in people with schizophrenia

Australian and New Zealand Journal of Psychiatry 2009: 43; 277-282

Chapman S, Ragg M, McGeechan K

Objective: A meta-analysis of 42 studies on tobacco smoking among schizophrenia subjects found an average smoking prevalence of 62% (range1488%). Statements are common, however, in the research literature and the media that between 80% and 90% of people with schizophrenia smoke. The purpose of the present paper was therefore to determine if citation bias exists in the over-citation and reportage of studies finding high rates of smoking prevalence in schizophrenia subjects.

Methods: Two hypotheses were tested: (i) that studies on the prevalence of smoking in people with schizophrenia reporting high smoking rates would be cited more often than studies reporting lower rates; and (ii) that statements about smoking rates among schizophrenic people on the Internet would report very high rates more often than more realistic, less dramatic rates.

Results: A 10% increase in reported prevalence of smoking was associated with a 61% (95% confidence interval (CI)3098%) increase in citation rate. Journal impact factor (IF) was significantly associated with citation rate (p0.001) but the country in which a study was carried out did not have an effect (p0.90). After adjusting for IF, a 10% increase in prevalence of smoking was associated with a 28% increase (95%CI162%) in citation rate. This bias is mirrored on the Internet, where statements abound about uncommonly highly rates of smoking by people with schizophrenia.

Conclusions: Studies reporting very high prevalence of smoking among people with schizophrenia are cited more often than those studies reporting a low prevalence, a result consistent with citation bias. This citation bias probably contributes to the misinformation available on the Internet, and may have adverse policy and clinical implications.

Read the full text.

Related projects

Share this:

What we are talking about…

Mark Ragg
Location: Sydney, Gadigal land
Description: Write, edit, research | Yulang Indigenous Evaluation with @MegBastard | Ragg & Co | Adjunct Fellow Indigenous health @UTS_GSH | @CroakeyNews | Equity, justice
Followers: 340

Ragg & Co

Ragg & Co
https://raggandco.com.au
mark.ragg@raggandco.com.au

ABN 43 715 501 282

We support the Uluru Statement from the Heart

Acknowledgement of Country
We acknowledge the traditional owners of the land on which we work, the Gadigal people of the Eora Nation. We pay our respects to Elders past, present and emerging.

© 2020 Ragg & Co.
Web Design & Development by Red Ant Media

×