Bars represent the annual prevalence of claims-based recurrent low back pain in the Canadian province of Quebec for men (black bars) and women (shaded bars). The 8-year mean prevalence for men (solid line) and women (dotted line) shows the difference between the sexes (shaded area). Both distributions display a progressive and significant decrease from 2000 to 2007.
Beaudet et al. BMC Musculoskeletal Disorders 2013 14:151 doi:10.1186/1471-2474-14-151