The prevalence varies between retrospective and prospective studies due to recall bias and the inclusion of minimal backache (Wang et al, 2004; Stapleton, MacLennan, and Kristiansson, 2002).
The prevalence variesbetween retrospective and prospective studies due torecall bias and the inclusion of minimal backache (Wanget al, 2004; Stapleton, MacLennan, and Kristiansson,2002).