Figure 3.

(a) Comparison of K6 total score distributions among the 21 different year groups. K6 total score distributions were commonly right-skewed and similar among all year groups. (b) On a log-normal scale, the distributions for all year groups exhibited a linear pattern with similar gradients, indicating that K6 total scores for all groups followed an exponential pattern with similar rate parameters. As indicated by arrows, at the lower end, distributions for all groups exhibited higher frequencies compared to those predicted from the exponential pattern. Auxiliary lines indicate the cut-points for moderate and severe psychological distress (a score of 5 and 13, respectively).