Fig. 1

Comparison of T-score among groups according to frequency of coffee intake. a The results of comparison of T-score among groups according to model 1 (frequency of coffee intake were categorized by group 1: seldom, group 2: once or twice per week and group 3: greater than or equal to once per 2 days). The mean T-score was −1.26, −1.05, and −1.05 in the three groups, respectively. There were no significantly differences among the three groups (P = 0.079). b The results of comparison of T-score among groups according to model 2 (frequency of coffee intake were categorized by group 1: seldom, group 2: moderate). The mean T-score was −1.26 and −1.05 in the two groups, respectively. There were significantly differences between the two groups (P = 0.024)