A Validated Grading Scale for Forehead Lines

BACKGROUND As with other facial wrinkles, the gradual loss and disorganization of collagen fibers and elastin, connective tissues that provide underlying support for skin, cause horizontal forehead rhytides in large part. OBJECTIVES To develop the Forehead Lines Grading Scale for objective quantification of horizontal forehead rhytides at rest and with expression and to establish the reliability of this photonumeric scale for clinical research and practice. MATERIALS AND METHODS The Forehead Lines Grading Scale is a 5‐point photonumeric rating scale that was developed to objectively quantify resting (static) and hyperkinetic (dynamic) forehead lines. Inter‐ and intrarater variability was assessed by computing intraclass correlation coefficients. RESULTS The agreement between the experts was highly significant. Bubble plots (bivariate scatter plots) demonstrated linearity in judgment by the experts. CONCLUSION The 5‐point photonumeric scale generated spans the severity of forehead lines for which patients commonly seek correction. The scale is well stratified for consistent rating.