Table 3.

Treatment results of magnetic resonance-guided high-intensity focused ultrasound for groups 1 and 2

Variable	All patients n = 76	Group 1 n = 21	Group 2 n = 55	P value
Acoustic sonication power (W)	141.0 ± 25.4 (90–250)	138.6 ± 25.9 (90–180)	142 ± 25.3 (100–250)	0.602
Treatment duration (min)	127.9 ± 55.0 (41–379)	125.4 ± 73.2 (61–379)	128.8 ± 47 (41–258)	0.808
Treatment speed (ml/min)	1.04 ± 0.61 (0.09–2.49)	1.08 ± 0.63 (0.25–2.18)	1.03 ± 0.61 (0.09–2.49)	0.740
Number of therapy sonications per treatment
overall	33.0 ± 12.2 (14–67)	32.3 ± 15.2 (14–67)	33.2 ± 10.9 (15–65)	0.763
4 mm	9.5 ± 12.1 (1–39)	11.8 ± 18.3 (1–39)	8.0 ± 7.4 (1–17)	0.659
8 mm	13.3 ± 10.3 (1–48)	9.1 ± 8.4 (3–28)	14.6 ± 10.6 (1–48)	0.191
12 mm	11.7 ± 9.3 (1–45)	12.8 ± 8.6 (2–30)	11.2 ± 9.7 (1–45)	0.607
14 mm	17.4 ± 12.7 (1–50)	19.9 ± 14.0 (1–50)	16.4 ± 12.2 (1–39)	0.385
16 mm	16.5 ± 14.1 (1–53)	12.5 ± 14.9 (1–46)	17.7 ± 13.9 (1–53)	0.366
NPV ratio (%)	90.3 ± 13.6 (32.0–100.0)	87.0 ± 14.1 (57.5–100.0)	91.5 ± 13.3 (32.0–100.0)	0.205

Values in parentheses represent ranges