Mean Mean
difference 		Standard
deviation 		P-valuea
Standing
position 		Sitting
position
Volume (cm3) 35.8 34.6 1.205 3.035 0.025
Mean area (cm2) 3.58 3.44 0.137 0.292 0.009
Minimum cross-sectional area (MCA, cm2) 2.36 2.29 0.071 0.331 0.213
Distance to MCA (cm) 12.54 12.05 0.491 3.348 0.392

aDifference between means, t-test. P-value was considered significant when P < 0.05.
MCA = minimum cross-sectional areas.