We targeted all residents in the town of Tajiri, Japan, aged 65 years or older (N = 3207). Of these, 1654 (51.6%) participated in the study (participant group 1). From among this population, 564 adults were randomly selected to receive magnetic resonance imaging (MRI). Finally, 497 participants (88.1%) (Participant Group 2) agreed to undergo MRI.
![Prevalence of Dementia and Dementing Diseases in Japan](https://cdn-ak-scissors.b.st-hatena.com/image/square/a9b26da92308256bf187a8d351ac5415853068e8/height=288;version=1;width=512/https%3A%2F%2Fcdn.jamanetwork.com%2Fama%2Fcontent_public%2Fjournal%2Fneur%2F6966%2Fnoc10326f1.png%3FExpires%3D2147483647%26Signature%3DACsHpsM6k1lQtTftGjlXK-SqzWkG93ZoRM7fZg0vDYRpEZSztyxpYOWDtggCIqxOWYChw6PR3VAksVbjSHuyUfj9tjiOpR3BvdPiCbTVpWJQ-q~gsvCj2aH0G~necnBUzoDJJB7GDDan21euRH-e6icDlicZCi7CXppsfVM1gtLUBPQjdw2t1K6Y2EqMfgQ~2ArGL43mNpKijqwqQkaPtqHO23SresVEspjUbhftmpb90fsVciUpV5NCqDThhjwkjj2r-u0b1qJEXA3IxHSHG5oA1TIwXPI76k1bkxNToF0~Bx1EqO2Xi6XZF~eMFqol5WoJDGIVMtn-56g0ZSqaiA__%26Key-Pair-Id%3DAPKAIE5G5CRDK6RD3PGA)