Figure 1

Distribution curves of serum calcium levels in lithium users ( n = 314) and non-lithium users ( n = 15). The red line illustrates the upper limit of the serum calcium level of 2.60 (mmol/L). The two dotted lines are placed upon the mean serum calcium levels of both groups; the left dotted line corresponds with the non-lithium users, the right dotted line with the lithium users.