There are multiple definitions:

1. codon adaptation index(English)

   • Adaptation & plasticity

2. computer assisted instruction (English)

   • ICAI
   • Computing (biomedical)

3. central apnea index(English)

   • defined as the number of central apneic episodes per hour of sleep
   • CSA, CSR
   • Pulmonology, Sleep medicine
   • https://doi.org…est.2017.06.010

4. chronic ankle instability(English)

   • presence of perceived instability may be important
   • KT, IAC, LAS, ROAST
   • Preventive medicine, Rehabilitation, Musculoskeletal system
   • https://doi.org…2-6050-46.2.133
   • https://doi.org…55/2022/8867724
   • https://doi.org…062-6050-542.06

5. clinical activity index(English)

   • refers to efficacy assessment of treatment
   • Pharmacology / pharmaceutics
   • https://doi.org…36/gut.49.6.783

6. chronic allograft injury(English)

   • CAR, CNI, CSA, HTN, MMF, SCAR, SRL, IF, TA, TAC
   • Injury, Coronary circulation
   • https://doi.org…rim.2008.08.005

7. condomless anal intercourse(English)

   • HIV, MSM, YMSM
   • Sexuality, Transmissible disease, AIDS
   • https://doi.org…033354918815182

8. community-acquired infection(English)

   • Infection, Public Health
   • https://doi.org…55/2024/6698387