Table 3.

The correlation coefficients and p values among Muller’s scores and ESS, AHI, BMI, NC and Min O₂ saturation

		Muller’s 1	Muller’s 2	Muller’s 3	Muller’s 4
ESS	Correlation coefficient	−0.047	0.033	0.034	0.057
	p Value	0.350	0.515	0.500	0.258
AHI	Correlation coefficient	0.042	0.226	0.105	0.203
	p Value	0.410	≤0.001	0.037	≤0.001
BMI	Correlation coefficient	0.066	0.211	0.099	0.156
	p Value	0.191	≤0.001	0.050	0.002
NC	Correlation coefficient	0.036	0.096	0.007	0.109
	p Value	0.473	0.056	0.895	0.031
Min O2	Correlation coefficient	−0.101	−0.240	−0.149	−0.181
	p Value	0.046	≤0.001	0.003	≤0.001

Spearman’s correlation test p < 0.05. BMI body mass index (kg/m²), NC neck circumference (cm), ESS epworth sleepiness scale score, AHI apnea hypopnea index, Min O ₂ minimum oxygen saturation, Muller’s 1 anteroposterior collapse (base of tongue) at retrolingual level, Muller’s 2 lateral pharyngeal wall collapse at retrolingual level, Muller’s 3 anteroposterior collapse (soft palate) at retropalatal level, Muller’s 4 lateral pharyngeal wall collapse at retropalatal level