title: [Classification of middle ear anomalies by a correspondence analysis method].
abstract: We studied on 70 cases of middle ear anomalies by a standard correspondence analysis method. The external meatus of these cases was open. We classified these 70 cases into the following four groups: type D: disruption between the long process of the incus and the movable oval window (54.3%), type F: immovable oval window with no disruption between the long process of the incus and the oval window (14.3%), type DF: anomalies with both immovable oval window and disruption between the long process of the incus and the oval window (18.6%), type O: anomalies of neither type D nor type F (12.9%). Half of these 70 cases had other miscellaneous anomalies, however, they did not affect the present results.
authors.affiliation: Department of Otolaryngology, Aoyama Tokyo Metropolitan Officers' Hospital.
authors.forename: Y
authors.initials: Y
authors.lastname: Nagao
authors.forename: Y
authors.initials: Y
authors.lastname: Nomura
authors.forename: Y
authors.initials: Y
authors.lastname: Ohashi
mesh_terms: D004432:Ear, Middle / Q000002:abnormalities*; D006801:Humans; D007188:Incus / Q000002:abnormalities; D015999:Multivariate Analysis; D010046:Oval Window, Ear / Q000002:abnormalities