There are multiple definitions:

1. percent spliced in(English)

   • statistic for measuring alternative splicing events, defined as the ratio of the relative abundance of all isoforms containing a certain exon over the relative abundance of all isoforms of the gene containing the exon; aka exon-inclusion ratio
   • GWAS
   • Genomics, Statistics
   • https://doi.org…CGEN.120.003131

2. proliferation signal inhibitor(English)

   • shows antineoplastic effects and may retard allograft vasculopathy
   • ISHLT
   • Transplantation, Therapeutic approaches, Vascular disease
   • https://doi.org…lun.2007.08.014

3. Psoriasis Symptom Inventory(English)

   • PASI
   • Dermatology

4. Protein Structure Initiative(English)

   • LIMS, NIH
   • Genomics

5. pneumonia severity index(English)

   • CAP, PORT
   • Pulmonology, Scoring systems/scales
   • https://www.mdc…erity-index-cap

6. pyogenic spinal infection(English)

   • CPS, CPR, ESR
   • Bacteriology, Infection, Spine (or spinal cord)
   • https://dx.doi.…0586-013-2995-y

7. Postponing Sexual Involvement(English)

   • effective in affecting students’ knowledge and beliefs about teenage pregnancy
   • ENABL
   • Pregnancy, Sexuality
   • https://doi.org…973159900900102

8. person separation index(English)

   • calculated as an indicator of internal consistency, with thresholds of PSI ≥ 0.80 considered adequate for person-level comparisons and PSI ≥ 0.70 adequate for group-level comparisons
   • ITC, PCS
   • Statistics
   • https://doi.org…955-020-01346-8

9. PsychoSocial Index(English)

   • a simple self-rated questionnaire, tailored to a busy clinical setting, for a comprehensive assessment of stress, psychological distress, abnormal illness behavior and well-being. It may provide a quantitative measurement of the degree of allostatic load, with opportunity to monitor its course over time
   • DCPR, DHEA
   • Psychology, Social aspects, Questionnaire
   • https://doi.org….1159/000510696

10. processing speed index(English)

    • one of four indices that make up this scale is derived from The Wechsler Adult Intelligence Scale-4th edition
    • WAIS
    • Cognitive function
    • https://doi.org…4419-1698-3_246

11. posterior stability index(English)

    • refers to stability under open-eye biped standing conditions
    • LSI, SI
    • Musculoskeletal system
    • https://doi.org…55/2022/8867724

12. Parent Stress Index(English)

    • HFS-P-YC, HFS, PHLOC, PSI-SF, YC
    • Stress (test), Scoring systems/scales
    • https://doi.org…55/2019/7935945

13. patient satisfactory index(English)

    • clinical improvement rate is significantly higher in patient with kyphosis apex at lower thoracic spine or thoracolumbar segment
    • Spine (or spinal cord), Surgery, Patient-centered (interest group)
    • https://doi.org…0586-016-4875-8

14. postsystolic shortening index(English)

    • calculated as 100×(PLS minus end-systolic strain)/PLS for each segment of interest when considering the regional aspect. PLS=peak longitudinal strain
    • AMVP, CMR, GLS, HeH, LGE, LV, MAD, MD, MR, MVP, PLS, PVC, SCA, SCD, STE
    • Cardiology, Biophysics, Medical imaging, Ratio-based metric
    • https://doi.org…GING.124.017051