title: Exploratory analysis of textual data from the Mother and Child Handbook using a text mining method (II): Monthly changes in the words recorded by mothers.
abstract: OBJECTIVE
  The aim of the study was to examine the possibility of converting subjective textual data written in the free column space of the Mother and Child Handbook (MCH) into objective information using text mining and to compare any monthly changes in the words written by the mothers.
  
  
  METHODS
  Pregnant women without complications (n = 60) were divided into two groups according to State-Trait Anxiety Inventory grade: low trait anxiety (group I, n = 39) and high trait anxiety (group II, n = 21). Exploratory analysis of the textual data from the MCH was conducted by text mining using the Word Miner software program. Using 1203 structural elements extracted after processing, a comparison of monthly changes in the words used in the mothers' comments was made between the two groups. The data was mainly analyzed by a correspondence analysis.
  
  
  RESULTS
  The structural elements in groups I and II were divided into seven and six clusters, respectively, by cluster analysis. Correspondence analysis revealed clear monthly changes in the words used in the mothers' comments as the pregnancy progressed in group I, whereas the association was not clear in group II.
  
  
  CONCLUSIONS
  The text mining method was useful for exploratory analysis of the textual data obtained from pregnant women, and the monthly change in the words used in the mothers' comments as pregnancy progressed differed according to their degree of unease.
authors.affiliation: Department of Obstetrics and Gynecology, International University of Health and Welfare Hospital, Tochigi, Japan.
authors.forename: Miki
authors.initials: M
authors.lastname: Tagawa
authors.affiliation: Department of Obstetrics and Gynecology, International University of Health and Welfare Hospital, Tochigi, Japan.
authors.forename: Yoshio
authors.initials: Y
authors.lastname: Matsuda
authors.affiliation: Perinatal Center, International University of Health and Welfare Hospital, Tochigi, Japan.
authors.forename: Tomoko
authors.initials: T
authors.lastname: Manaka
authors.affiliation: Department of Psychiatry, International University of Health and Welfare Hospital, Tochigi, Japan.
authors.forename: Makiko
authors.initials: M
authors.lastname: Kobayashi
authors.affiliation: Department of Obstetrics and Gynecology, International University of Health and Welfare Hospital, Tochigi, Japan.
authors.forename: Michitaka
authors.initials: M
authors.lastname: Ohwada
authors.affiliation: Department of Psychiatry, Jichi Medical University, Tochigi, Japan.
authors.forename: Shigeki
authors.initials: S
authors.lastname: Matsubara
mesh_terms: D000328:Adult; D001007:Anxiety; D057225:Data Mining / Q000379:methods*; D005260:Female; D055991:Health Records, Personal; D006801:Humans; D009035:Mothers / Q000523:psychology*; D011247:Pregnancy; D011446:Prospective Studies; D055815:Young Adult
keywords: Mother and Child Handbook; State-Trait Anxiety Inventory; correspondence analysis; pregnant woman with unease; text mining method