Table 3.

Binomial logistic regression analysis of factors related to acute mountain sickness.

Variables	Univariable		Multivariable		Multivariable
	ORa (95% CI)	P valueb	OR (95% CI)	P value	OR (95% CI)	P value
Age (years)	1.016 (0.942-1.096)	.69	N/Ac	N/A	N/A	N/A
Male (Y/Nd)	2.333 (0.684-7.960)	.18	N/A	N/A	N/A	N/A
BMI (kg/m2)	1.037 (0.852-1.262)	.72	N/A	N/A	N/A	N/A
Tobacco (Y/N)	1.636 (0.268-9.980)	.59	N/A	N/A	N/A	N/A
Alcohol (Y/N)	4.000 (0.744-21.496)	.11	N/A	N/A	N/A	N/A
HRe (beats/min)	1.048 (0.982-1.118)	.16	N/A	N/A	N/A	N/A
SpO2f (%)	0.907 (0.558-1.472)	.69	N/A	N/A	N/A	N/A
SBPg (mm Hg)	1.002 (0.965-1.040)	.91	N/A	N/A	N/A	N/A
DBPh (mm Hg)	0.983 (0.932-1.037)	.53	N/A	N/A	N/A	N/A
VO2max-CPETi (mL·kg-1·min-1)	0.807 (0.686-0.949)	.01	0.770 (0.640-0.926)	.006	N/A	N/A
VO2max-SWTj (mL·kg–1·min–1)	0.765 (0.635-0.922)	.005	N/A	N/A	0.720 (0.578-0.898)	.004
RBCk (10–9/L)	0.711 (0.219-2.308)	.57	N/A	N/A	N/A	N/A
HGBl (g/L)	0.949 (0.889-1.012)	.11	N/A	N/A	N/A	N/A
HCTm (%)	0.923 (0.800-1.066)	.28	N/A	N/A	N/A	N/A
MCVn (fL)	0.966 (0.876-1.064)	.48	N/A	N/A	N/A	N/A
MCHo (pg)	0.892 (0.660-1.205)	.46	N/A	N/A	N/A	N/A
MCHCp (g/L)	0.999 (0.961-1.038)	.95	N/A	N/A	N/A	N/A
RDW-CVq (%)	1.177 (0.999-1.386)	.05	1.263 (1.028-1.553)	.03	1.273 (1.027-1.577)	.03
RDW-SDr (fL)	0.985 (0.850-1.141)	.84	N/A	N/A	N/A	N/A

^aOR: odds ratio.

^bDifferences were considered statistically significant if P<.05.

^cN/A: not applicable.

^dY/N: yes/no.

^eHR: heart rate.

^fSpO₂: oxygen saturation.

^gSBP: systolic blood pressure.

^hDBP: diastolic blood pressure.

ⁱVO₂max-CPET: maximum oxygen consumption measured by cardiopulmonary exercise test.

^jVO₂max-SWT: maximum oxygen consumption estimated by smartwatch test.

^kRBC: red blood cell.

^lHGB: hemoglobin.

^mHCT: hematocrit.

ⁿMCV: mean corpuscular volume.

^oMCH: mean corpuscular hemoglobin.

^pMCHC: mean corpuscular hemoglobin concentration.

^qRDW-CV: red blood cell distribution width-coefficient of variation.

^rRDW-SD: red blood cell distribution width-standard deviation.