Chronic conditions and multimorbidity in population aged 90 years and over: associations with mortality and long-term care admission The need for long-term care (LTC) rises during the last years or months of life. Time spent in LTC during the end of life seems to have increased, possibly since people are living longer and suffering from more chronic conditions than before [11]. In younger old people, dementia and Parkinson's disease, as well as multimorbidity, have been associated with the need for LTC [12, 13]. Prior research is scarce on chronic conditions or multimorbidity as predictors of LTC use in the oldest old population. The study examines to what extent chronic conditions and multimorbidity predict mortality and LTC admission in the population aged 90 and over, and assesses the population attributable fractions of mortality and LTC admission for individual chronic conditions. Methods Sample The data were based on four cross-sectional waves of the Vitality 90+ Study conducted in 2001, 2003, 2007 and 2010 [14]. Each study year the mailed survey included both community-dwelling and institutionalized residents aged 90 years and over in the city of Tampere, Finland (in 2017 with 231,853 inhabitants, of whom 19% were aged over 65 and 0.9% aged over 90 [15]). The response rate varied between 79% and 86%. Due to high mortality, most participants (n = 1,650) responded to only one survey. Of the remainder, 1,004 participated in two surveys, 176 three surveys and 32 all four surveys. The sample used in the analysis concerning mortality included 2,862 participants (79.5% women). The LTC analysis used a subsample of 1,954 respondents living in their own homes at baseline. Proxy answers were included for participants who could not answer the questionnaire themselves.