Validation of the Asian Midface Volume Deficit Severity Scale

Area of Science:

• Aesthetic Medicine
• Facial Rejuvenation
• Dermatology

Background:

• Facial aging patterns and aesthetic needs differ between Asian and Caucasian populations, influencing rejuvenation strategies.
• Existing methods for assessing midface volume deficits may not adequately address the specific characteristics of Asian facial anatomy.
• The Asian Midface Volume Deficit Severity Scale (AMVDSS) was developed by LBTD to provide an objective tool for evaluating Asian individuals.

Purpose of the Study:

• To evaluate the reliability and consistency of the Asian Midface Volume Deficit Severity Scale (AMVDSS) in assessing midface volume deficits.
• To determine the interobserver and intraobserver agreement for the AMVDSS when applied to randomized photographs of Asian patients.

Main Methods:

• Four independent observers assessed randomized photographs of 65 Asian patients (18 male, 47 female; mean age 40.9 years) using the AMVDSS.
• Photographs were taken from multiple angles (front, 45°, and 90° left and right) and rated across two sessions separated by a 2-week interval.
• Interobserver and intraobserver agreement were quantified using weighted kappa statistics and exact agreement percentages.

Main Results:

• Interobserver agreement was substantial to almost perfect for both left and right sides across both assessment sessions (weighted κ ranging from 0.774 to 0.938).
• Exact interobserver agreement ranged from 76.9% to 93.9%, indicating high consistency among raters.
• Intraobserver agreement was 'almost perfect' for both left and right sides (weighted κ: 0.950 and 0.954, respectively), with exact agreement rates of 95.0% and 95.4%.

Conclusions:

• The Asian Midface Volume Deficit Severity Scale (AMVDSS) demonstrates high reliability and consistency for assessing midface volume deficits in Asian individuals.
• The AMVDSS can be effectively used to evaluate outcomes following dermal filler injections for midface rejuvenation in the Asian population.
• The scale's robust interobserver and intraobserver agreement supports its utility in clinical practice and research for objective assessment.