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Summary: The purpose of this paper is to describe rates of forearm fractures in adults in Norway 2008–2019. Incidence rate of distal forearm fractures declined over time in both sexes. Forearm fracture constitute a significant health burden and prevention strategies are needed. Purpose: To assess age- and sex-specific incidence rates, and time trends for forearm fractures in Norway, and compare these with incidence rates in other Nordic countries. Methods: Data on all patients aged 20–107 years with forearm fractures treated in Norwegian hospitals from 2008 to 2019 was retrieved from the Norwegian Patient Registry. Fractures were identified based on International Classification of Disease 10th revision code S52. Age- and sex-specific incidence rates and changes in incidence rates were calculated. Results: We identified 181,784 forearm fractures in 45,628,418 person-years. Mean annual forearm fracture incidence rates per 100,000 person-years were 398 (95% CI 390–407) for all, 565 (95% CI 550–580) for women, and 231 (95% CI 228–234) for men above 20 years. Mean annual number of forearm fractures was 15,148 (95% CI 14,575–15,722). From 2008 to 2019, age-adjusted total incidence rates of forearm fractures S52 diagnoses declined by 3.5% (incidence rate ratio (IRR) of 0.997 (95% CI 0.994–0.999)) in men. The corresponding decline in women was not significant (IRR: 0.999 (95% CI 0.997–1.002)). In the same period, the age-adjusted incidence rates of distal forearm fractures declined by 7.0% in men (IRR = 0.930; 95% CI 0.886–0.965) and 4.7% in women (IRR = 0.953; 95% CI 0.919–0.976). The incidence rates of distal forearm fractures were similar to rates in Sweden and Finland. Conclusion: Age-adjusted incidence rates of distal forearm fractures in both sexes declined over time. [ABSTRACT FROM AUTHOR]

• The Danish Lung Cancer Registry monitors interventions and outcomes for all Danish citizens diagnosed with lung cancer going back to the year 2000. • Data from the Danish Lung Cancer Registry is frequently used for research purposes. • The data in the Danish Lung Cancer Registry are highly accurate compared to information found in medical records. This study evaluates the validity of the information in the Danish Lung Cancer Registry (DLCR). Since 2000, the DLCR has been a tool for monitoring interventions and outcome of all Danish lung cancer patients with the intent to streamline and improve treatment and survival. The DLCR receives information from the Danish Patient Registries in addition to clinical information from the treating physicians. In the year 2022, more than 50 papers have been published using DLCR as a data source. However, the DLCR has not previously been validated. A random sample of 1000 patients diagnosed with non-small cell lung cancer from 2014 to 2016 and recorded in the DLCR were included for validation. Medical records were reviewed and were considered as the "gold standard" to which data listed in the DLCR were compared. Information was retrieved from medical charts for all patients. Agreement on stage at diagnosis was 90.1 % (95 % CI 88.0–91.9) and on date of diagnoses was 93.8 (95 % CI 92.1–93.2). Agreement on smoking status in pack years (+/- 10 pack years) was 91.2 % (95 % CI 88.6–93.2). The positive predictive value of treatment intent was 87.4 (95 % CI 85.1–89.6). The data in the DLCR are complete, detailed and accurate. The comparison of data from the DLCR with the medical records revealed overall high validity of the data in the registry. [ABSTRACT FROM AUTHOR]