title: Two-point scoring method for the evaluation of pattern hair loss by phototrichogram using a headband and a tapeline.
abstract: BACKGROUND
  A phototrichogram scalp measurement method using a headband and a tapeline was introduced as a non-invasive and economical measuring technique.
  
  
  OBJECTIVE
  To evaluate the reliability and reproducibility of the two-point scoring method by phototrichogram using a headband and a tapeline.
  
  
  METHODS
  The scalp hair of seven volunteers were measured in triplicate at the 'P' and 'V' points by three dermatologists. To calculate the degree of disease progression, we used a two-point ('P' point and 'V' point) scoring method. Statistical analyses for the evaluation of inter- and intra-investigator reliability and variability were performed.
  
  
  RESULTS
  Overall intraclass correlation coefficients (ICCs) of intra-investigator reliability demonstrated ICCs with excellent agreement for all parameters, including the number and thickness of hair at the 'P' and 'V' points, as well as calculated degree of disease progression. ICCs of inter-investigator reliability demonstrated ICCs with excellent agreement in all parameters, except mean hair thickness at the 'P' point. Overall intra-investigator variability demonstrated coefficients of variation (CVs) ranging from 2.6% to 9.8%, whereas inter-investigator variability demonstrated CVs ranging from 2.9% to 6.3%.
  
  
  CONCLUSIONS
  We suggest that a two-point scoring using our method is a non-invasive and economical measurement technique with high reliability and reproducibility.
authors.affiliation: Department of Dermatology and Cutaneous Biology Research Institute, Yonsei University College of Medicine, Seoul, Korea.
authors.forename: Si-Hyung
authors.initials: SH
authors.lastname: Lee
authors.forename: Jin-Soo
authors.initials: JS
authors.lastname: Kang
authors.forename: In Kyung
authors.initials: IK
authors.lastname: Jeon
authors.forename: Hye Sun
authors.initials: HS
authors.lastname: Lee
authors.forename: Sung Bin
authors.initials: SB
authors.lastname: Cho
mesh_terms: D000328:Adult; D000505:Alopecia / Q000175:diagnosis*; D046169:Dermoscopy / Q000295:instrumentation* / Q000379:methods; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005260:Female; D057918:Fiducial Markers; D006801:Humans; D007089:Image Enhancement / Q000295:instrumentation; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D008297:Male; D015588:Observer Variation; D010781:Photography / Q000295:instrumentation* / Q000379:methods; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012720:Severity of Illness Index