Background: Botulinum toxin has been widely accepted as safe and effective for the treatment of glabellar lines, and previous studies have classified glabellar contraction patterns into 5 categories.
Objective: To classify the glabellar contraction patterns among a large-scale Chinese population and provide a reference for injections in Chinese patients.
Methods: Four hundred eighty-nine Chinese subjects who received botulinum toxin for the treatment of glabellar lines were selected for a retrospective photographic analysis of their glabellar contraction patterns.