title: Validation of the Japanese version of the Ford Insomnia Response to Stress Test and the association of sleep reactivity with trait anxiety and insomnia.
abstract: OBJECTIVE
  Our study was conducted to validate the Japanese version of the Ford Insomnia Response to Stress Test (FIRST-J) and to clarify the association of the measure with trait anxiety and insomnia in healthy subjects and insomnia patients.
  
  
  METHODS
  We studied 161 healthy subjects and 177 insomnia patients who completed the FIRST-J, Pittsburgh Sleep Quality Index (PSQI), Athens Insomnia Scale (AIS), and State-Trait Anxiety Inventory-Trait (STAI). The healthy subjects and the insomnia patients were classified, respectively, into two groups with high FIRST-J and low FIRST-J scores (divided by the median value of healthy subjects).
  
  
  RESULTS
  Cronbach α coefficients of the FIRST-J in the insomnia patients and healthy subjects were 0.89 and 0.87, respectively. Factor analysis revealed that the FIRST-J had a single-factor structure. The FIRST-J score significantly correlated with all other measures in the healthy subjects, though the score only correlated with the score of the STAI in the insomnia patients. The healthy subjects with high FIRST-J scores showed higher scores of the AIS and STAI than those with low FIRST-J scores. Furthermore, insomnia patients had a higher total score of the FIRST-J than the healthy subjects.
  
  
  CONCLUSIONS
  The FIRST-J is an important tool for assessing vulnerability to insomnia.
authors.affiliation: Department of Somnology, Tokyo Medical University, Tokyo, Japan; Department of Psychiatry, Tokyo Medical University, Tokyo, Japan; Japan Somnology Center, Neuropsychiatric Research Institute, Tokyo, Japan; Yoyogi Sleep Disorder Center, Tokyo, Japan.
authors.forename: Shun
authors.initials: S
authors.lastname: Nakajima
authors.affiliation: Department of Somnology, Tokyo Medical University, Tokyo, Japan; Japan Somnology Center, Neuropsychiatric Research Institute, Tokyo, Japan; Yoyogi Sleep Disorder Center, Tokyo, Japan.
authors.forename: Isa
authors.initials: I
authors.lastname: Okajima
authors.affiliation: Department of Somnology, Tokyo Medical University, Tokyo, Japan; Japan Somnology Center, Neuropsychiatric Research Institute, Tokyo, Japan.
authors.forename: Taeko
authors.initials: T
authors.lastname: Sasai
authors.affiliation: Department of Somnology, Tokyo Medical University, Tokyo, Japan; Department of Psychiatry, Tokyo Medical University, Tokyo, Japan; Yoyogi Sleep Disorder Center, Tokyo, Japan.
authors.forename: Mina
authors.initials: M
authors.lastname: Kobayashi
authors.affiliation: Department of Somnology, Tokyo Medical University, Tokyo, Japan; Department of Psychiatry, Tokyo Medical University, Tokyo, Japan.
authors.forename: Naomichi
authors.initials: N
authors.lastname: Furudate
authors.affiliation: Henry Ford Hospital Sleep Disorders and Research Center, Detroit, MI, USA; Department of Psychiatry and Behavioral Neurosciences, Wayne State College of Medicine, Detroit, MI, USA.
authors.forename: Christopher L
authors.initials: CL
authors.lastname: Drake
authors.affiliation: Henry Ford Hospital Sleep Disorders and Research Center, Detroit, MI, USA; Department of Psychiatry and Behavioral Neurosciences, Wayne State College of Medicine, Detroit, MI, USA.
authors.forename: Thomas
authors.initials: T
authors.lastname: Roth
authors.affiliation: Department of Somnology, Tokyo Medical University, Tokyo, Japan; Department of Psychiatry, Tokyo Medical University, Tokyo, Japan; Japan Somnology Center, Neuropsychiatric Research Institute, Tokyo, Japan; Yoyogi Sleep Disorder Center, Tokyo, Japan. Electronic address: inoue@somnology.com.
authors.forename: Yuichi
authors.initials: Y
authors.lastname: Inoue
mesh_terms: D001007:Anxiety / Q000150:complications* / Q000175:diagnosis; D016022:Case-Control Studies; D005260:Female; D006801:Humans; D007564:Japan; D008297:Male; D008875:Middle Aged; D010555:Personality Inventory; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012890:Sleep; D007319:Sleep Initiation and Maintenance Disorders / Q000209:etiology* / Q000523:psychology; D013315:Stress, Psychological / Q000150:complications* / Q000175:diagnosis; D011795:Surveys and Questionnaires
keywords: Anxiety; Ford insomnia response to stress test; Insomnia; Scale; Sleep reactivity; Stress