There are multiple definitions:

1. urinary incontinence(English)

   • vaginal birth does not increase the prevalence or severity of incontinence later in life
   • AI, DI, SMIS, UUI
   • Urology, Pregnancy, Obstetrics
   • https://doi.org…1038/ncpuro0389

2. uncertainty interval(English)

   • GAP, MSVI, WHA
   • Statistics, Ophthalmology
   • https://doi.org…109X(20)30489-7

3. utility index(English)

   • EQ-5D UI, COVID-19, QOL, EQ-5D-5L
   • Vaccination, Virology, Quality of life
   • https://doi.org…598-023-43058-1