Table 2.

Demographic Data of Patients in the Imaginary Experiment Described in Table 1

Variables	Group A	Group B
Number of patients	51	53
Age (yr)	56.1 (13.7)	61.2 (14.9)
Body weight (kg)	65.7 (13.8)	57.7 (11.6)
Observation time (h)	11.3 (6.7)	8.9 (7.7)
Fentanyl used	19 (37.3%)	22 (41.5%)

All data are presented as mean (SD) or number (%).