Table 3.

p value of each parameter in the quadratic polynomial equations of extraction yield and the contents of cormarin, cinnmic acid, cinnamaldehyde, and cinnamyl alcohol from Cinnamomum cassia blume by subcritical extraction process

Parameter	p value of each parameter in quadratic polynomial eqations
	Y1	Y2	Y3	Y4	Y5
Constant	0.000	0.000	0.000	0.000	0.000
X1	0.001	0.000	0.000	0.000	0.000
X2	0.060	0.009	0.036	0.002	0.002
X3	0.775	0.043	0.332	0.022	0.022
X21	0.919	0.010	0.683	0.415	0.415
X22	0.678	0.214	0.093	0.009	0.009
X23	0.643	0.175	0.024	0.002	0.002
X1X2	0.893	0.274	0.106	0.778	0.778
X1X3	0.993	0.547	0.954	0.043	0.043
X2X3	0.425	0.032	0.128	0.008	0.008

X1 = extraction temperature (°C), X2 = extraction time (min), X3 = extraction pressure (bar), Y1 = extraction yield (%), Y2 = content of coumarin (%), Y3 = content of Cinnamic acid (%), Y4 = content of cinnamaldehyde (%), Y5 = content of cinnamyl alcohol (%)