Table 4.

Regression analysis for drug abuse effect and propofol on midazolam requirement

Group		Regression Coefficient	P	95% CI
				Lower	Upper
Clonidine	Yes	-5.41	0.05	-10.96	0.13
	No	Reference	Reference	Reference	Reference
Propofol	Yes	0.003	0.07	0.000	0.007
	No	Reference	Reference	Reference	Reference
Drug abuse	No	-7.91	0.008	-13.62	-2.21
	Yes	Reference	Reference	Reference	Reference