Before revision:  We aim to investigate the cross-cultural comparability of IADL. METHODS: IADL were measured in 3,571 individuals (67.1 +- {\pm} 9.5 years old, 44.7\% female) in 11 international studies using the Amsterdam IADL Questionnaire (A-IADL-Q).
After revision:  We aim to investigate the cross-cultural comparability of IADL. METHODS: IADL were measured in 3,571 individuals (67.1 +- {\pm} 9.5 years old, 44.7\% female) from the Netherlands, Spain, France, United States, United Kingdom, Greece, Serbia and Finland were included. Functional impairment was measured using the Amsterdam IADL Questionnaire (A-IADL-Q).