Readability, understandability and language accessibility of Swedish websites about the coronavirus disease 2019: a cross-sectional study

BACKGROUND: The COVID-19 pandemic has caused significant morbidity and mortality. To mitigate its spread, members in the general population were prompted to apply significant behavioral changes. This required an effective dissemination of understandable information accessible for people with a wide range of literacy backgrounds. The aim of this study was to investigate the readability, understandability and language accessibility of Swedish consumer-oriented websites containing information about COVID-19. METHODS: Websites were identified through systematic searches in Google.se (n = 76), and were collected in May 2020 when the pandemic spread started in Sweden. Readability and understandability were assessed with the Readability Index, the Ensuring Quality Information for Patients (EQIP) tool, and the Patient Education Materials Assessment Tool Understandability subscale (PEMAT-PU). RESULTS: The median total sample score for Readability Index was 42.0, with the majority of scores being classified as moderate (n = 30, 39%) or difficult (n = 43, 57%). Median total sample scores were for EQIP 54.0% (IQR = 17.0, Range = 8–75) and for PEMAT-PU 60.0% (IQR = 14.75, Range = 12–87). The majority of the websites did not have any texts or links containing information in an alternative language (n = 58, 76%). CONCLUSIONS: Swedish websites contained information of difficult readability and understandability at the beginning of the coronavirus disease 2019 pandemic, with few providing information available in alternative languages. It is possible that these deficits contributed to the spread and impact of the virus. There is a need for studies investigating methods aiming to enhance the readability, understandability and language accessibility of web-based information at the beginning of an epidemic or pandemic. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1186/s12911-022-01873-y.