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Table 1 Characteristics of patients with non specific chronic low back pain before treatment in continuous ultrasound and placebo ultrasound groups

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) (n=25)
Mean SD 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 4.1 25.3 3.5 .39
Sex 25%female _ 75%male 50%female _ 50%male  
  1. * Ultrasound.
  2. ** Body Mass Index.
  3. ***p values are for baseline differences between the two groups. Significance level ≤ .05.