Scores for sentiment analysis returned by LIWC (A; mean percentage and 95% confidence interval, CI), SentimentR (B; mean score and 95% CI), and Stanford CoreNLP (C; mean score and 95% CI) for peer review reports in four broad areas of research for female reviewers (left) and male reviewers (right) using single-blind review. See Supplementary files 5–7 for summary data, mixed model linear regression coefficients and residuals, and examples of reports with high and low scores for sentiment according to LIWC, SentimentR and Stanford CoreNLP analysis.