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Abstract Background The Norwegian Tonsil Surgery Register (NTSR) was launched in January 2017. The purpose of the register is to present data on tonsil surgery to facilitate improvements in patient care. Data used for evaluating the quality of medical care needs to be of high reliability. This study aims to assess the inter-rater reliability (IRR) of the variables reported to the register by medical professionals. Methods The study population consists of the first 137 tonsil surgery patients who were included in the NTSR at St. Olav’s University Hospital in Trondheim. An experienced rater completed the register’s paper form for all 137 patients based on their electronic medical records, blinded for the data already in the register. To assess the inter-rater reliability between the register and the external rater, we calculated observed agreement, Cohen’s kappa and Gwet’s AC1 coefficients with 95% confidence intervals. Results All tested variables in the NTSR have almost perfect reliability except for the variable for the cold steel technique, which had a substantial to almost perfect reliability. The inter-rater agreement was substantial to almost perfect for every variable, with substantial (kappa/AC1 > 0.61) to almost perfect (kappa/AC1 > 0.81) agreement for all the examined variables. Conclusion This study shows that the reliability of the NTSR is high for all variables registered by the professionals at the hospital immediately after surgery.

'Aim': To evaluate the Hearing Disability and Handicap Scale (HDHS) in an unselected population of adults with hearing impairment. 'Subjects and methods': A total of 342 consecutive adults who consulted the outpatient unit of audiology in the ENT department of a Norwegian university hospital answered HDHS, which intends to assess the negative consequences of hearing loss. The psychometric evaluation included internal structure analyses and made use of principal factors followed by varimax rotation, construct validity by corrected item–total correlation, and internal consistency reliability by Cronbach's alpha coefficient. 'Results': HDHS showed good psychometric properties with three factors, i.e. speech perception (five items), non-speech sound (five items) and participation restriction (10 items). All had good internal consistency reliability. The inventory distinguished between activity limitations and other problems related to social life participation. 'Conclusion:' HDHS was found to be adequate for research and clinical purposes in an unselected adult population with a quite different cultural background and language than the original one.