Table 2. Comparison of patient groups with hypocalcaemia (n = 2,447) and hypercalcaemia (n = 113) with normocalcaemic patients (n = 5,710).

Medians and interquartile ranges. (Mann-Whitney U, p<0.05*)

Parameter	Hypocalcaemia	Normocalcaemia	Hypercalcaemia
Age	63 (47;76)*	55 (38;70)	66 (50;75) *
Length of stay	4 (0;10)*	1 (0;6)	3 (0;10) *
Creatinine	83 (68;114) *	71 (60;86)	74 (58;102) *
eGFR (MDRD)	90 (60;117) *	96 (76;116)	72 (47;96) *
Sodium	138 (136;141) *	139 (138;141)	139 (136;141)
Osmolality	292 (283;311)	291 (285;301)	296 (282;312)
Chloride	103 (99;107)	103 (100;106)	100 (94;108)
Phosphate	1.01 (0.82;1.24)	1.00 (0.84;1.16)	1.08 (0.85;1.40)
Calcium	2.12 (2.05;2.16) *	2.31 (2.25;2.37)	2.63 (2.58;2.76) *
Potassium	3.9 (3.6;4.2)	3.9 (3.7;4.2)	4 (3.6;4.3)
Magnesium	0.79 (0.70;0.87)*	0.82 (0.75;0.88)	0.83 (0.73;0.91)