Ambient temperature, solar radiation and sickness absence due to mental disorders in Finland: A distributed lag non-linear regional analysis

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BACKGROUND: Changes in ambient temperature and solar radiation have been associated with mental health but their relationship with sickness absence due to mental disorders is unclear. METHODS: We linked nationwide weekly sickness absence registers with meteorological data (2006 to 2017), collected from all 22 mainland counties and 5 larger areas in Finland, and used distributed lag non-linear models (DLNM) to explore potential non-linear and delayed relationships. RESULTS: . To some extent, the relationships of sickness absence with both temperature and solar radiation reflected the climatic differences between the northern and southern parts of the country. CONCLUSIONS: In Finland, higher exposure to temperature and solar radiation are associated with lower levels of sickness absence due to mental disorders whereas colder temperatures and lower amount of solar radiation are associated with higher levels. The associations for low solar radiation were more robust than those for low temperatures, with a typical delay of up to a couple of weeks.

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