Table 3.

Proportional volumes of each lung and each lobe relative to the total lung volume on CT in the supine and standing positions (n = 32 volunteers)

	Proportional volumes of each lung and each lobe relative to the total lung volume, %		p value supine vs. standing
	supine	standing
Total (bilateral) lung	100.0±0.0	100.0±0.0	-
	(100.0–100.0)	(100.0–100.0)
Right lung	53.6±1.5	53.3±1.3	0.0467
	(50.6–57.4)	(50.5–56.3)
Right upper lobe	17.9±2.4	17.6±2.3	0.0011
	(11.8–22.7)	(12.0–21.9)
Right middle lobe	9.3±1.6	8.5±1.4	<0.0001
	(6.6–13.8)	(6.1–11.6)
Right lower lobe	26.5±2.6	27.2±2.2	0.0003
	(22.3–34.0)	(22.4–33.7)
Left lung	46.4±1.5	46.7±1.3	0.0470
	(42.6–49.4)	(43.7–49.5)
Left upper lobe	23.1±2.1	22.4±2.0	<0.0001
	(18.1–26.6)	(17.1–25.8)
Left lower lobe	23.2±2.4	24.3±2.4	<0.0001
	(19.4–28.7)	(20.7–29.6)

Values are presented as average ± standard deviation (range).