title: Reliability and validity of the Time-Sensitive ADHD Symptom Scale in adults.
abstract: OBJECTIVE
  The objective of this study was to examine the psychometric properties of the Time-Sensitive ADHD Symptom Scale (TASS) to evaluate change of attention-deficit/hyperactivity disorder (ADHD) symptoms over the course of a day in adults.
  
  
  METHODS
  Eighty adults with ADHD participated in 1 or 2 visits, 1 to 9 weeks apart. At each visit, participants completed the TASS followed by raters administering the ADHD Rating Scale (ADHD-RS). Additional TASS and ADHD-RS ratings were completed 2 to 6 hours after each visit via telephone. Internal consistency of TASS items was assessed by Cronbach's α. Convergent validity of TASS and ADHD-RS total mean item scores was assessed using Pearson's correlation coefficients. κ correlations were calculated to assess item-by-item reliability between TASS and ADHD-RS items.
  
  
  RESULTS
  Internal consistency of TASS items was high, with an overall Cronbach's α coefficient of .93. The Pearson's correlation coefficient between the TASS and ADHD-RS was significant for all visits (r = 0.70, P < .0001). There was moderate agreement between individual items on the TASS and ADHD-RS, with significant κ coefficients for almost all items (P < .05).
  
  
  CONCLUSIONS
  The TASS showed high internal consistency and concurrent validity with the clinician-administered ADHD-RS and is a valid and reliable scale for measuring change in ADHD symptoms over the course of a day in adults.
authors.affiliation: Department of Psychiatry, NYU School of Medicine, New York, NY 10010, USA. lenard.adler@nyumc.org
authors.forename: Lenard A
authors.initials: LA
authors.lastname: Adler
authors.forename: David M
authors.initials: DM
authors.lastname: Shaw
authors.forename: Thomas J
authors.initials: TJ
authors.lastname: Spencer
authors.forename: Jeffrey H
authors.initials: JH
authors.lastname: Newcorn
authors.forename: David J
authors.initials: DJ
authors.lastname: Sitt
authors.forename: Melinda
authors.initials: M
authors.lastname: Morrill
authors.forename: Jennifer V
authors.initials: JV
authors.lastname: Davidow
authors.forename: Stephen J
authors.initials: SJ
authors.lastname: Glatt
authors.forename: Stephen V
authors.initials: SV
authors.lastname: Faraone
mesh_terms: D000328:Adult; D001289:Attention Deficit Disorder with Hyperactivity / Q000175:diagnosis* / Q000523:psychology; D005260:Female; D006801:Humans; D008297:Male; D011569:Psychiatric Status Rating Scales / Q000592:standards*; D011594:Psychometrics; D015203:Reproducibility of Results; D013997:Time Factors