There are multiple definitions:

1. oversampling rate(English)

   • Signal analysis

2. operational sex ratio(English)

   • often used as a predictor of the intensity of competition for mates, as it describes the relative number of males and females who are ready to mate
   • HSDD, SD
   • Sexuality, Ratio-based metric, Gender aspects
   • https://doi.org/10.1086/657918

3. open surgical repair(English)

   • technique in which the abdomen is cut open and the dilated aorta is repaired using fabric graft material
   • AAA, AoS, Arch AA, BTAI, EVAR, IMH, PSA, PTFE, PWV, TAA, TAAA, TBAD, TEVAR
   • Surgery, Vascular disease
   • https://doi.org…jvs.2022.01.008