Table 6.

Multiple linear regression analysis with serum lactate as an outcome variable (adjusted R²=0.37) and %TST below 95% SaO2 as a predictor variable (controlling for age, BMI, and WHR).

Independent variables	Coefficient	Standard error	t	P
Constant	−2.36
Age (year)	0.02	0.02	0.99	.33
BMI	0.01	0.03	0.28	.78
WHR	1.93	1.86	1.04	.31
%TSTs below 95% SaO2	0.02	0.01	2.40	.02

%TST: percentage of total sleep time, SaO₂: arterial oxygen saturation, BMI: body mass index, WHR: waist-hip ratio.