Study	Item selected for qualitative harmonization	Original coding
Active Ageing	Do you feel you have more problems with your memory than most?	1 = yes, 2 = no
CFAS	Have you ever had any difficulty with your memory? If yes, is that a problem for you?	0 = no, 1 = yes, moderate, 2 = yes, severe
EAS	Compared with one year ago, do you have trouble remembering things more often, less often or about the same?	1 = more often, 2 = less often, 3 = about the same
SLASII	Overall, how would you rate your memory or other mental abilities as compared to earlier period of your life (more than one year ago)?	1 = much better, 2 = a bit better, 3 = a bit worse, 5 = much worse

Note: only 4 of the 16 studies included in the project are shown.