3.1 Basic characteristics of subjects based on status of osteoporosis
Out of the 998 participants, a total of 172 cases were reported to have ED, where the percentage was 16.1%, and the percentage of osteoporosis was 10.5% (112/998) in this study. The median age of this population was 44 years (Range: 18~87 years). The distribution of socio-economic and clinical biochemical characteristics according to the group with osteoporosis were presented in Table 1 . Compared with the non-osteoporosis population, the osteoporosis population presented with a higher SBP, DBP, TC and LDL-C (all P<0.05). The osteoporosis group was closely correlated with a low percentage of education, but a high percentage of smoking and alcohol consumption (all P <0.05). Importantly, as shown in Figure 2 , the bone density in ED was lower than that in non-ED group (-1.9 vs. -1.2, P <0.001) and the percentage of osteoporosis in the ED group was higher when compared with the non-ED group (31.25% vs. 13.77%, P <0.001).