Hospital utilisation in Australia, 1993-2020, with a focus on use by people over 75 years of age: a review of AIHW data.

OBJECTIVES: To assess Australian hospital utilisation, 1993-2020, with a focus on use by people aged 75 years or more. DESIGN: Review of Australian Institute of Health and Welfare (AIHW) hospital utilisation data. SETTING, PARTICIPANTS: Tertiary data from all Australian public and private hospitals for the financial years 1993-94 to 2019-20. MAIN OUTCOME MEASURES: Numbers and population-based rates of hospital separations and bed utilisation (bed-days) (all and multiple day admissions) and mean hospital length of day (multiple day admissions), overall and by age group (under 65 years, 65-74 years, 75 years or more). RESULTS: Between 1993-94 and 2019-20, the Australian population grew by 44%; the number of people aged 75 years or more increased from 4.6% to 6.9% of the population. The annual number of hospital separations increased from 4.61 million to 11.33 million (146% increase); the annual hospital separation rate increased from 261 to 435 per 1000 people (66% increase), most markedly for people aged 75 years or more (from 745 to 1441 per 1000 people; 94% increase). Total bed utilisation increased from 21.0 million to 29.9 million bed-days (42% increase), but the bed utilisation rate did not change markedly (1993-94, 1192 bed-days per 1000 people; 2019-20, 1179 bed-days per 1000 people), primarily because the mean hospital length of stay for multiple day admissions declined from 6.6 days to 5.4 days; for people aged 75 years or more it declined from 12.2 to 7.1 days. However, declines in stay length have slowed markedly since 2017-18. Total bed utilisation was 16.8% lower than projected from 1993-94 rates, and was 37.3% lower for people aged 75 years or more. CONCLUSION: Hospital bed utilisation rates declined although admission rates increased during 1993-94 to 2019-20; the proportion of beds occupied by people aged 75 years or more increased slightly during this period. Containing hospital costs by limiting bed availability and reducing length of stay may no longer be a viable strategy.