Across the 27 journals adopting transparent peer review included in this study, authors that submitted manuscripts to the journals were "opted-in" to transparent peer review unless they opted-out. Table 3 gives an overview of the percentage of author who remained opted-in to transparent peer review across the subject disciplines. The percentage of authors who remained opted-in was slightly higher in the subjects of earth and environmental sciences and veterinary medicine and slightly lower in the social and behavioural sciences.