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Table 2 Subgroup analysis of lithium users with normal serum calcium levels compared to lithium users with hypercalcemia

From: Hypercalcemia in patients with bipolar disorder treated with lithium: a cross-sectional study

  Lithium users with serum calcium level ≤2.60 (mmol/l) (n= 265) Lithium users with serum calcium level >2.60 (mmol/l) (n= 49) p value
Gender (% female) 60.4 67.3 0.457
Age (years) 47 (13) 50 (13) 0.174
Lithium recent dosage (mg dd) 960 (270) 970 (330) 0.759
Creatinine (μmol/l) 76.82 (17.00) 81.91 (26.89) 0.091
TSH (mU/l) 2.8 (3.8) 2.0 (1.8) 0.176
Sodium (mmol/l) 140.5 (2.20) 140.7 (2.61) 0.610
Potassium (mmol/l) 4.5 (0.34) 4.5 (0.37) 0.349
Lithium serum level (mmol/l) 0.74 (0.19) 0.77 (0.18) 0.379
Lithium period (months) 109 (84) 165 (111) 0.002
Lifetime dosage quotient 1.03 × 105 (8.3 × 104) 1.63 × 105 (1.3 × 105) 0.002
  1. Mean values and standard deviation (SD) between brackets. Statistical differences were calculated by means of the Pearson’s chi-square test (gender) and Student’s independent t test (all other variables).