From: The effect of continuous ultrasound on chronic non-specific low back pain: a single blind placebo-controlled randomized trial
Parameter
Continuous US*
Placebo US
P value***
(n=25)
Mean
SD
Age(years)
31.4
12.3
37.4
11.9
.09
Onset since first episode(years)
5.8
4.1
8.1
4.7
.08
BMI**
24.4
25.3
3.5
.39
Sex
25%female _ 75%male
50%female _ 50%male