How often do US-based schizophrenia papers published in high-impact psychiatric journals report on race and ethnicity? : A 20-year update of Lewine and Caudle (1999)

Background
Racial and ethnic disparities have been clearly documented in schizophrenia studies, but it is unclear how much research attention they receive among US-based studies published in high-impact journals.

Aims
The current paper updates Lewine and Caudle’s (1999) and Chakraborty and Steinhauer’s (2010) works, which quantified how frequently schizophrenia studies included information on race and ethnicity in their analyses.

Method
We examined all US-based papers on schizophrenia-spectrum, first-episode psychosis, and clinical high-risk groups, published between 2014 to 2016 in four major psychiatric journals: American Journal of Psychiatry, Journal of the American Medical Association – Psychiatry, Schizophrenia Bulletin, and Schizophrenia Research.

Results
Of 474 US-based studies, 62% (n = 295) reported analyses by race or ethnicity as compared to 20% in Lewine and Caudle’s (1999) study. The majority of papers (59%) reported sample descriptions, a 42% increase from Lewine and Caudle’s (1999) study. Additionally, 47% matched or compared the racial/ethnic composition of primary study groups and 12% adjusted for race (e.g., as a covariate). However, only 9% directly analyzed racial and/or ethnic identity in relation to the primary topic of the paper.

Conclusions
While schizophrenia studies report analyses by race and ethnicity more frequently than 20 years ago, there remains a strong need for systematic, nuanced research on this topic. The authors offer recommendations for how to conceptualize and report upon race and ethnicity in schizophrenia research.