J Eiamcharoenwit, P Akavipat - Journal of Anaesthesiology …, 2024 - journals.lww.com
Results: ED50s of fentanyl in groups 1 (20–35 years), 2 (36–50 years), 3 (51–65 years), and
4 (66–80 years) were 2 μg/kg (90% confidence interval, 1.50–2.50), 2.25 μg/kg (2.00–2.50) …