1. Hair pull test: Evidence-based update and revision of guidelines
Katherine A. McDonald, BScH, Amanda J. Shelley, BScH, Sophia Colantonio, MPH, MD, Jennifer Beecker, MD, CCFP(EM), FRCPC, FAAD 
Journal of the American Academy of Dermatology 
Volume 76, Issue 3, Pages (March 2017)
DOI: /j.jaad
Copyright © 2016 American Academy of Dermatology, Inc. Terms and Conditions

2. Fig 1
Mean number of hairs removed during the hair pull test by time since last hair washing. There was no statistical difference between the groups. *The previous range is demonstrated for comparison. Based on the previous literature, up to 5-6 hairs were expected from hair pulls in healthy participants.
Journal of the American Academy of Dermatology  , DOI: ( /j.jaad )
Copyright © 2016 American Academy of Dermatology, Inc. Terms and Conditions

3. Fig 2
Mean number of hairs removed during the hair pull test by time since last hair brushing. There was no statistical difference between the groups.
Journal of the American Academy of Dermatology  , DOI: ( /j.jaad )
Copyright © 2016 American Academy of Dermatology, Inc. Terms and Conditions

4. Fig 3
Mean number of hairs removed during the hair pull test by age group and sex. There was no statistical difference between the groups.
Journal of the American Academy of Dermatology  , DOI: ( /j.jaad )
Copyright © 2016 American Academy of Dermatology, Inc. Terms and Conditions