Fig. 2

Comparison of prevalence of osteoporosis among groups according to frequency of fish food intake. a The results of comparison of prevalence of osteoporosis among groups according to Model 1 (Model 1: frequency of fish food intake were categorized by group 1: seldom, group 2: once or twice per week, group 3: once per 2 days, and group 4: always). The prevalence of osteoporosis was 15.96, 9.10, 6.22, and 5.75% in the four groups, respectively. There were significantly differences among the four groups (P = 0.028 and P value for trend =0.014). b The results of comparison of prevalence of osteoporosis among groups according to Model 2 (Model 2: frequency of fish food intake were categorized by group 1: seldom, group 2: sometimes, group 3: always). The prevalence of osteoporosis was 15.96, 8.34, and 5.75% in the three groups, respectively. There were significantly differences among the three groups (P = 0.027 and P value for trend =0.036). c The results of comparison of prevalence of osteoporosis between groups according to Model 3 (Model 3: frequency of fish food intake were categorized by low frequency and high frequency groups). The prevalence of osteoporosis was 9.95 and 6.10% between the two groups, respectively. There were significantly differences between the two groups (P = 0.039 and P value for trend =0.040)