Table 2

- Association of BMI with BHT and of BHT with DOH in the study population.

Pearson correlation		R² Linear	Pearson r	P-value
(Along the x-axis)	(Along the y-axis)	R² Linear	Pearson r	P-value
BMI^{^*} of all subjects	BHT^{^*} of all subjects	0.008	−0.08	0.34
BMI^{^*} of men	BHT^{^*} of men	0.06	−0.24	0.11
BMI^{^*} of women	BHT^{^*} of women	0.008	−0.092	0.497
BHT of all subjects	DOH^{^*} of all subjects	0.41	0.64	0.000^{^*}
BHT of men	DOH^{^*} of men	0.37	0.604	0.000^{^*}
BHT of women	DOH^{^*} of women	0.268	0.518	0.000^{^*}
Regression analysis		β coefficient	*Odds ratio^{^}**	P-value
Independent variable	Dependent variable	β coefficient	*Odds ratio^{^}**	P-value
BMI^{^*} of all subjects	BHT^{^*} of all subjects	−0.087	−0.76 to 0.29	0.38
BMI^{^*} of men	BHT^{^*} of men	−0.241	−1.53 to 0.17	0.11
BMI^{^*} of women	BHT^{^*} of women	−0.092	−0.76 to 0.37	0.497
BHT of all subjects	DOH^{^*} of all subjects	0.637	0.48 to 0.80	0.000^{^*}
BHT of men	DOH^{^*} of men	0.604	0.37 to 0.88	0.000^{^*}
BHT of women	DOH^{^*} of women	0.518	0.29 to 0.77	0.000^{^*}

↵^* BMI: body mass index (kg/m²),
↵^* BHT: breath holding time (sec.),
↵^* DOH: duration of hyperventilation (sec.),
↵^* p<0.05 is significant,
↵odds ratio^* = 95% confidence interval