Table 1. Patient characteristics.

	N = 30
Age, years median (range)	41.7 (23–65)
Group 1: Asymptomatic subjects, never treated for low back pain
Male, n (%)	5 (50)
Spondylosis, n (%)	0 (0)
Group 2: Acute low back pain with a normal spinal radiology studies
Male, n (%)	5 (50)
Spondylosis, n (%)	0 (0)
Group 3: Acute low back pain, with lumbar degeneration and spondylosis
Male, n (%)	6 (60)
Spondylosis, n (%)	10 (100)