PTH and kidney disorder: As shown in Table 6, history of fracture was positively correlated with age (r = 0.231, P = 0.000), PTH (r = 0.039, P = 0.014), diabetes (r = 0.044, P = 0.024), Cardio-cerebrovascular diseases (r = 0.105, P = 0.000) and chronic liver and kidney diseases (r = 0.043, P = 0.027).