# A comprehensive model for characterizing Chinese female facial skin laxity by expert assessment, consumer perception, and noninvasive skin physiological parameters

## TL;DR

This study creates a model to measure facial skin looseness in Chinese women using expert ratings, consumer opinions, and skin tests, helping improve beauty treatments.

## Contribution

A new Facial Skin Laxity Index (FSLI) was developed to evaluate product effectiveness in reducing skin laxity.

## Key findings

- Facial skin laxity is negatively correlated with skin elasticity R2 values.
- Facial skin laxity is positively correlated with skin elasticity F4 values.
- The FSLI enables precise evaluation of product performance in improving facial skin laxity.

## Abstract

This study used expert assessment, consumer perception, and noninvasive measurements of skin physiological parameters to develop a mathematical model for characterizing facial skin laxity in Chinese females, providing the scientific basis for personalized beauty and skin-firming strategies. The study involved 64 Chinese females (18–60 years) whose facial regions were imaged using VISIA-CR. Five experts assessed facial skin laxity using VISIA-CR images, while 72 consumers compared paired images to identify higher laxity. Noninvasive measurements of skin elasticity and other parameters were taken. The data were analyzed using Bradley-Terry analysis and support vector machine regression modeling. Consistent with expectations, facial skin laxity was negatively correlated with skin elasticity R2 values and positively correlated with skin elasticity F4 values. A novel Facial Skin Laxity Index (FSLI) was introduced to evaluate product efficacy in reducing laxity. Facial skin laxity can be characterized and quantified using a combination of expert assessments, consumer perceptions, and noninvasive measurements. The FSLI enables precise evaluation of product performance in improving facial skin laxity.