IVC	Reading						Discharge (n = 20)	T	p
IVC	1^st (n = 20)	2^nd (n = 20)	3^rd (n = 20)	4^th (n = 10)	5^th (n = 8)	6^th (n = 2)	Discharge (n = 20)	T	p
Diameter (mm)
Min. - Max.	18.0 - 28.0	17.0 - 29.0	14.0 - 27.0	16.0 - 26.0	16.0 - 25.0	16.0 - 23.0	14.0 - 26.0	11.384	<0.001*
Mean ± SD.	23.30 ± 3.06	22.10 ± 3.52	20.50 ± 3.47	21.50 ± 3.57	20.88 ± 3.04	19.50 ± 4.95	19.75 ± 3.16
Median	23.0	23.0	20.50	21.50	20.50	19.50	20.0
Collapsibility index
Min. - Max.	10.0 - 60.0	18.0 - 60.0	20.0 - 65.0	25.0 - 60.0	35.0 - 60.0	45.0 - 60.0	35.0 - 65.0	6.840*	<0.001*
Mean ± SD.	32.30 ± 14.40	35.60 ± 13.58	43.50 ± 12.47	42.50 ± 10.61	49.37 ± 9.80	52.50 ± 10.61	50.75 ± 8.32
Median	32.50	30.0	45.0	42.50	47.50	52.50	50.0