F2 and bone fracture: If the history of menopause was added to the model in women, it was significantly associated with the prevalence of low back pain (P = 0.02; OR: 1.36; 95% CI: 1.05, 1.75), while the prothrombin index (P = 0.14), the history of bone fracture (P = 0.08) and the amount of salt consumed (P = 0.08) were no longer significantly associated with the prevalence of low back pain.