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Table 5 External 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 External Iliac Vein Volume (cm3)  
Dehydrated Hydrated P value
Supine 4.5 ± 1.9 5.4 ± 2.0 <0.01
Prone 5.8 ± 1.9 6.3 ± 1.9 <0.01
P value <0.01 <0.01