Table 5. Correlations between PSG parameters and changes in body compositions parameters.

Variables	Change in NC	Δ left arm	Δ right arm	Δ trunk	Δ left leg	Δ right leg	Δ head and neck
AHI	0.696**	0.263	0.307	0.348*	−0.525**	−0.780**	0.333
ODI	0.634**	0.188	0.266	0.342*	−0.490*	−0.690**	0.324
Mean SpO2	−0.577**	−0.161	−0.279	−0.133	0.433*	0.711**	−0.398*
Minimal SpO2	−0.518**	−0.216	−0.240	−0.204	0.426**	0.771**	−0.391*

Δ fluid shift volume; the values in the table are Pearson correlation coefficient(r) adjusted by age, gender and body mass index; *, P<0.05; **, P<0.01. PSG, polysomnography; NC, neck circumference; AHI, apnea-hypopnea index; ODI, oxygen desaturation index.