To be more exact, it is 70-80% of hospital-aquired UTIs are catheter linked.

https://pubmed.ncbi.nlm.nih.gov/31532742/

The infection rate is initially 3-10% but increases by 5% for every day its left in.

Some more information here on biofilm development and sepsis/mortality rates which is chilling.

https://pmc.ncbi.nlm.nih.gov/articles/PMC2963580/