Table 2. Mass characteristics and the effect on ablation procedure.

Variable	Baseline	Median time(min)	Power(W)	Insertion	6 months post ablation	12 months post ablation	P value
≤1 cm		3.0(0.5-8.0)	26.3±8.1	1.0±0.0
No. of masses	33
Median volume(ml)	0.4(0.2-0.5)				0.1(0.01-0.4)*	0.01(0.01-0.4)*	0.046
VRR(%)					71.4±28	89.3±20.8
1.1-2.0cm		3.0(1.0-11.5)	28.5±4.7	1.1±0.3
No. of masses Median volume(ml) VRR(%)	112 1.4(0.6-4.2)				0.3(0.1-2.6)* 58.3±42.9	0.1(0.01-1.8)* 84.7±27.6	0.001
>2.0cm		3.9(1.3-18.3)	30.5±8.2	1.5±0.5
No. of masses Median volume(ml)	42 4.8(1.1-47.6)				1.8(0.5-31.1) *	1.8(0.5-28.8) *	0.13
VRR(%)					45.3±28.8	55.9±32.9
P value
Volume	<0.001	0.37	0.004	<0.001	<0.001	<0.001
VRR†					0.006	<0.001

Note.— Unless otherwise indicated, data are means ± standard deviation.

Data in parentheses are ranges.

*P<0.001when compared with baseline data.

^†P<0.01 when compared between 1.1-2.0cm and >2.0cm masses and between ≤1 cm and >2.0cm masses, P>0.05 when compared between ≤1 cm and 1.1-2.0cm masses.

VRR; Volume reduction ratio.