Figure 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 (Model 1: frequency of coffee intake were categorized by group 1: seldom, group 2: sometimes, group 3: always). The mean T-score was -1.91, -1.62 and -1.52 in the three groups, respectively. There were significantly differences among the three groups (P value < 0.001). B. The results of comparison of T-score between groups according to Model 2 (Model 2: frequency of coffee intake were categorized by low frequency and high frequency groups). The mean T-score was -1.91 and -1.57 in the two groups, respectively. There were no significantly differences between the two groups (P value < 0.001).