There are multiple definitions:

1. Patient Review Instrument(English)

2. pair-recall index(English)

   • SDF, TRD, TRT

3. PR-interval(English)

   • normally between 0.12 and 0.2 s
   • ECG, HR

4. prospectieve risico-inventarisatie(Dutch)

   • IVIM, VMS
   • Risk factor

5. population reference intake(English)

   • RDA, RDI, RNI
   • Nutrition, Diet
   • https://doi.org…199708000-00022

6. proliferation rate index(English)

   • refers to anti-leukemic and cytogenetic effects of an alkylating agent
   • 4-Me-CABA, SCE
   • Leukemia, Therapeutic approaches
   • https://pubmed.…h.gov/12174917/