From: Bupivacaine–fentanyl isobaric spinal anesthesia reduces the risk of ICU admission in elderly patients undergoing lower limb orthopedic surgery
Odds ratio
95% CI
P value
Spinal vs. General anesthesia
0.240
0.115–0.498
< 0.01
Age ≥ 80 years vs. < 80 years
7.219
3.814–13.664
Operation time ≥ 1.5 h vs. < 1.5 h
8.346
4.283–16.264
Preoperative diabetes
3.027
1.420–6.451