OBJECTIVE To identify inter-individual examiner factors associated with interrater reliability in a summative communication OSCE in the 4th study year. METHODS The OSCE consists of 4 stations assessed with a 4-item 5-point global rating instrument. A bivariate secondary analysis of interrater reliability in relation to 4 examiner factors (gender, profession, OSCE experience, examiner training) was conducted. Intraclass correlation coefficients (ICC) were calculated and compared between examiner dyads of different similarity. RESULTS 169 pairwise ratings from 19 different examiners in 16 dyads were analysed. Interrater reliability is significantly higher in examiner dyads of same vs. different gender (ICC=0.76 (95%CI=0.65-0.83) vs. ICC=0.41 (95%CI=0.21-0.57)), in dyads of two clinicians vs. non-clinical/mixed professions (ICC=0.72 (95%CI=0.56-0.83) vs. ICC=0.57 (95%CI=0.41-0.69)), and in dyads with high vs. low/mixed OSCE experience (ICC=0.73 (95%CI 0.50-0.87) vs. ICC=0.56 (95%CI=0.41-0.69)). Participation in recent examiner training had no influence on ICCs. CONCLUSION Better concordance of ratings between clinically active examiners might be a hint for context specificity of good communication. Higher interrater reliability between examiners with same gender may indicate gender-specific communication concepts. PRACTICE IMPLICATIONS Medical faculties introducing summative assessment of communication competence should focus the influence of examiner characteristics on interrater reliability.