Table 1.

Participant information

Participant characteristic	Cases	Controls
Male gender	53%	53%
Age (years)	36.8 (7.4)	36.6 (7.4)
Height (cm)	172.7	172.3
Pain	6.5 (1.6)	0.0
Pain extends below knee	10%	N/A
Duration of episode (days)	8.9 (8.9)	N/A
Previous episode of low back pain (%)	50%	50%

Continuous data are mean values (SD); Pain was rated on a 0–10 scale