Indian Journal of Dermatology (Jan 1995)
Hardness Of Human Finger Nails
Abstract
This paper presents the Rockwell superficial hardness of human finger nails in vitro and its difference due to age, sex and pathological conditions. A highly significant (p<0.01) negative correlation (r = - 0.78) is found to exit between the thickness (X) and the superficial hardness (Y) of the upper surface of the finger nails, The regression equation of Y on X is Y= - 32.26X + 63.82.