Table 1.

Participant characteristics^a

	Saline control group	Remifentanil group
Experiment 1
Age	27.2 ± 1.1 years	25.7 ± 1.1 years
Body weight	77.6 ± 2.0 kg	79.8 ± 2.6 kg
Initial HPT	43.7 ± 0.8°C	44.6 ± 0.6°C
Depression score	9.7 ± 1.0	8.6 ± 0.7
Pain awareness score	52.7 ± 3.8	52.6 ± 4.3
Experiment 2
Age	27.4 ± 1.1 years	27.5 ± 1.1 years
Body weight	76.7 ± 2.5 kg	76.4 ± 1.1 kg
Initial HPT	41.3 ± 0.6°C	42.4 ± 0.6°C
Depression score	8.2 ± 0.5	8.5 ± 0.5
Pain awareness score	51.5 ± 3.5	56.5 ± 3.7

^aData are the average group values (mean ± SEM).