Fig. 3.  The change of mean upper airway collapsibility (passive PCRIT) at four different heights of head elevation in the fixed-jaw and free-jaw conditions. *P < 0.05 versus  neutral position (0 cm head elevation). NS = nonsignificance with P > 0.05.

Fig. 3.  The change of mean upper airway collapsibility (passive PCRIT) at four different heights of head elevation in the fixed-jaw and free-jaw conditions. *P < 0.05 versus  neutral position (0 cm head elevation). NS = nonsignificance with P > 0.05.

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