RT Journal
A1 Wasko CA, Mackley CL, Sperling LC, Mauger D, Miller JJ
T1 STandardizing the 60-second hair count
JF Archives of Dermatology
JO Archives of Dermatology
YR 2008
FD June 1
VO 144
IS 6
SP 759
OP 762
DO 10.1001/archderm.144.6.759
UL http://dx.doi.org/10.1001/archderm.144.6.759
AB Objective 
    To define the range of normal for a standardized 60-second hair count in men without alopecia.Design 
    Convenience sample.Setting 
    Hospital-based practice.Participants 
    The study included 60 healthy men (age range, 20-60 years) without evidence of alopecia.Main Outcome Measure 
    Range of normal for a standardized 60-second hair count.Results 
    Among the 20- through 40-year-old men, the shedding range was 0 to 78 hairs, with a mean of 10.2 hairs. Among the 41- through 60-year-old men, the range was 0-43 hairs, with a mean of 10.3 hairs. Low intrapatient variability for hair counts was found in both age groups, indicating consistent results on consecutive days for all participants. When repeated 6 months later in both age groups, the hair counts did not change much. The hair counts were repeated and verified by a trained investigator, with results similar to those of subject hair counts.Conclusion 
    A properly performed 60-second hair count is a simple, practical, and reliable tool for the assessment of hair shedding.