title: Alternative items for identifying hierarchical levels of physical disability by using physical performance tests in women aged 75 years and older.
authors.affiliation: Graduate School of Comprehensive Human Sciences, University of Tsukuba, Tsukuba, Ibaraki, Japan. mijiak@stat.taiiku.tsukuba.ac.jp
authors.forename: Mi-Ji
authors.initials: MJ
authors.lastname: Kim
authors.forename: Noriko
authors.initials: N
authors.lastname: Yabushita
authors.forename: Maeng-Kyu
authors.initials: MK
authors.lastname: Kim
authors.forename: Tomoaki
authors.initials: T
authors.lastname: Matsuo
authors.forename: Junko
authors.initials: J
authors.lastname: Okuno
authors.forename: Kiyoji
authors.initials: K
authors.lastname: Tanaka