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Table 4 Common Iliac Vein Volume (cm3) in supine vs. prone positioning with dehydration vs. hydration in 8 volunteers

From: Pelvic cardiovascular magnetic resonance venography: venous changes with patient position and hydration status

Patient Position Common Iliac Vein Volume (cm3)  
Dehydrated Hydrated P value
Supine 4.6 ± 1.8 5.8 ± 2.1 <0.01
Prone 5.4 ± 1.9 6.7± 2.1 <0.01
P value <0.001 <0.001