TABLE 1.

Effects of H₂S on isoflurane-induced loss of righting reflex

	Isoflurane in 21% Oxygen	Isoflurane + 80 ppm H2S in 21% Oxygen	Isoflurane + 250 ppm H2S in 21% Oxygen
EC50, %atm	0.89	0.81***	0.67***
95% confidence interval for EC50, %atm	0.87–0.90	0.80–0.82	0.62–0.72
Hill slope	26	27	11*
95% confidence interval for Hill slope	18–35	19–35	2–20

^* , P < 0.05;

^*** , P < 0.001 with respect to isoflurane alone.