Expired tidal volumes were significantly lower during inflations when using nasal tube compared with face mask ( @ -LSB- @-@ @ -RSB- vs @ -LSB- @-@ @ -RSB- mL/kg ; P < @ ) and when spontaneous breathing coincided with PPV ( @ -LSB- @-@ @ -RSB- vs @ -LSB- @-@ @ -RSB- mL/kg ; P < @ ) but were similar during breathing on continuous positive airway pressure ( @ -LSB- @-@ @ -RSB- vs @ -LSB- @-@ @ -RSB- mL/kg ; P > @ ) .