There are multiple definitions:

1. arterial stiffness index(English)

   • a noninvasive measure of arterial stiffness using infra-red fnger sensors (photoplethysmography)
   • PWV, AIx, CAD, CVD, VSI, PPf
   • Vascular disease, Hemodynamics, Genomics, Atherosclerosis /atherogenic
   • https://doi.org…598-019-45703-0

2. addiction severity index(English)

   • BRMES, SANS, SHAPS
   • Addiction and health, Psychology
   • https://doi.org…952990701202954

3. acne severity index(English)

   • refers to topical treatment of mild to moderate acne vulgaris
   • AV, CDP, CS, SA, TLC, TRA
   • Dermatology, Scoring systems/scales
   • https://doi.org…0378-6323.51247

4. 16-item Anxiety Sensitivity Index(English)

   • ASI-R
   • Anxiety/fear, Scoring systems/scales
   • http://pubmed.n…h.gov/14567167/