Table 1.

Harmonization of items and response options from the FAQ, ECog, and A-IADL-Q

Harmonization	FAQ	ECog	A-IADL-Q
Cohort(s)	ADNI, NACC	ADNI, HABS	ADC, EMIF pre-AD and 90+
Item content
Hot beverages	Heating water, making a cup of coffee, turning off the stove	–	Using the coffee maker
Paperwork	Assembling tax records, business affairs, or other papers	Keeping financial records organized	Managing their household paperwork
Response options
Normal (4)	Normal (0)	Better or no change (1)	No more difficult (0)
Slightly worse (3)	Has difficulty, but does by self (1)	Questionable/occasionally worse (2)	Slightly more difficult (1)
Worse (2)	–	Consistently a little worse (3)	More difficult (2)
Much worse (1)	Requires assistance (2)	–	Much more difficult (3)
Unable (0)	Dependent (3)	Consistently much worse (4)	No longer able to perform this task (4)

Abbreviations: ADC Amsterdam Dementia Cohort, ADNI Alzheimer’s Disease Neuroimaging Initiative, A-IADL-Q Amsterdam Instrumental Activities of Daily Living Questionnaire, ECog Everyday Cognition, EMIF European Medical Information Framework, FAQ Functional Activities Questionnaire, HABS Harvard Aging Brain Study, NACC National Alzheimer’s Coordinating Center