Table 5. Results of the logistic regression analysis for AIP.

Variable	β	SE	Wald value	P value	OR	95% CI of OR
X1 (Ca 19–9)	3.247	1.121	8.392	0.004	25.720	2.858–231.430
X2 (E%)	2.412	0.737	10.712	0.001	11.155	2.632–47.287
X3 (Globulin)	1.940	0.684	8.038	0.005	6.956	1.820–26.588
X4 (Hemoglobin)	1.768	0.724	5.963	0.015	5.859	1.417–24.216
Constant	-6.091	1.280	22.660	<0.001	0.002	-

β: partial regression coefficient; SE: standard error of partial regression coefficient; OR: odds ratio; CI: confidence interval

P = 1/[1+e^{-(-6.091+3.24X1+2.412X2+1.940X3+0.724X4)}]

X1 = 1: Ca19-9<306.75u/ml; X1 = 0: Ca19-9>306.75u/ml

X2 = 1: E%>4.15%; X2 = 0: E%<4.15%

X3 = 1: Globulin>29.80 g/L; X3 = 0: Globulin<29.80 g/L

X4 = 1: Hb (M) < 114.5 g/L; X4 = 0: Hb (M) > 114.5 g/L

Hb (F) < 118.5 g/L; Hb (F) > 118.5 g/L