TABLE 1.

Presentation of the mean number (± standard deviation) of H³He MR ventilation defects per slice (VDS) for the group of 12 subjects imaged at three time points: Baseline supine, 45-minute supine, and immediately after turning prone.

	Baseline	* p	45 min.	* p	Prone	* p
Entire lung	0.87 ± 0.89		1.43 ± 0.96		1.00 ± 0.67
Anterior	0.40 ± 0.036	0.625	0.24 ± 0.029	0.007	0.59 ± 0.076	0.058
Posterior	0.47 ± 0.072		1.19 ± 0.161		0.41 ± 0.048
Defects <3 cm	0.69 ± 0.064	0.012	1.28 ± 0.154	0.034	0.92 ± 0.053	0.001
Defects >3 cm	0.17 ± 0.015		0.16 ± 0.016		0.08 ± 0.008
Right Lung	0.43 ± 0.044	0.893	0.66 ± 0.112	0.428	0.56 ± 0.076	0.227
Left Lung	0.44 ± 0.067		0.78 ± 0.145		0.44 ± 0.049
Superior	0.37 ± 0.037	0.307	0.66 ± 0.123	0.396	0.48 ± 0.062	0.500
Inferior	0.50 ± 0.071		0.77 ± 0.136		0.53 ± 0.067

^*Refers to the difference between the two values shown to the left of each p-value