Fig. 1From: Roles and mechanisms of leptin in osteogenic stimulation in cervical ossification of the posterior longitudinal ligamentRelationship between the leptin/BMI (body mass index) ratio and serum insulin and biochemical maker, ALP concentrations with female and male OPLL patients. There was a negative, significant correlation between the leptin/BMI ratio and ALP (p < 0.05). a, c Females OPLL. b, d Males OPLLBack to article page