Table 1. Baseline characteristics of all patients with calcium measurement at hospital admission (n = 8,270).

Parameter	Median (Interquartile range)
Age (years)	58 (41;72)
Length of stay (days)	2 (0;7)
Creatinine (μmol/l)	72 (60;90)
eGFR (MDRD) (ml/min/1,73m2)	95 (72;116)
Sodium (mmol/l)	139 (137;141)
Osmolality (mosm/kg)	291 (284;306)
Chloride (mmol/l)	103 (100;106)
Phosphate (mmol/l)	1.01 (0.83;1.19)
Calcium (mmol/l)	2.26 (2.18;2.34)
Potassium (mmol/l)	3.9 (3.7;4.2)
Magnesium (mmol/l)	0.81 (0.73;0.88)