Table 6.

Univariate and adjusted logistic regression for variables at baseline to predict HAH. (N = 129)

	Predictors	β-coefficient	Odds ratio	(95% CI)		P value
				Lower	Upper
Univariate logistic regression
	CO	0.650	1.915	1.158	3.168	0.011*
Left side VA	Vm	0.095	1.099	1.008	1.198	0.031*
Right side MCA	Vm	0.071	1.073	1.021	1.127	0.005**
	Vs	0.039	1.040	1.005	1.076	0.026*
	Vd	0.087	1.091	1.024	1.161	0.007**
Right side VA	Vm	0.099	1.104	1.007	1.211	0.035*
Adjusted logistic regression
Model 1
Left VA	Vm	0.094	1.099	1.007	1.199	0.035*
	CO	0.478	1.613	1.031	2.522	0.036*
Model 2
Right side MCA	Vm	0.064	1.066	1.015	1.121	0.011*
	CO	0.594	1.811	1.080	3.036	0.024*

Model 1: Adjusted by primary variables (V_s and V_d of right side MCA)

Model 2: Adjusted by calculated variable (V_m of right side MCA)

Baseline CO was an independent predictor for HAH at 3700 m, whereas, V_m in left VA or right MCA was also independent predictors for HAH in different models

Only the variable with a significant statistically has been listed above

* p is 0.05 or less, ** p is 0.01 or less