Assuming that AHIVCOS is representative for Austria, the total estimate using the modelling tool of the European Centre for Disease Prevention and Control (ECDC) for people living with HIV in Austria at the end of 2022 is 11,860. This is an overestimate, as the recording of people who have left the country is very incomplete (e.g. migrant workers from Europe who mainly work in the tourism industry, rejection of asylum applications). According to the umbrella organisation of social insurance institutions, 7,768 people received treatment with anti-HIV drugs ("antiretroviral therapy -ART") in 2022, 64% of whom were cared for by AHIVCOS treatment centres. Using the ECDC tool, it can be estimated that between 86.5 % and 92.2 % of people with HIV in Austria are receiving antiretroviral therapy. This results in an estimate of 8,400 to 9,000 people in Austria who were living with HIV at the end of 2022.

The cohort study was founded in 2001 and now represents a follow-up of 133,774 patient-years, including 2,966 deaths. However, data from patients who died in earlier years is missing.

The average age rose from 39.2 years in September 2002 to 50.8 years in 2024. 25.1% of patients who were followed up in the last twelve months are female. The rate is highest in Burgenland (33.4%) and Upper Austria (31%).

In 2024, 57.1% of new HIV diagnoses concerned people with Austrian citizenship. Overall, the majority of cohort participants also have Austrian citizenship (68.6%).