. 2020 Mar 10;10:4418. doi: 10.1038/s41598-020-61459-4

Table 3.

Associations of calcium status stratified by ionized and corrected calcium with the primary outcome in the final model.

Adjusted hazard ratio		Corrected calcium
Adjusted hazard ratio		Low	Normal
Ionized calcium	Normal	N = 1	N = 64
	Normal	—	Reference
	Low	N = 83	N = 134
	Low	1.79 (0.65–4.99)	2.76 (1.16–6.59)

Adjusted hazard ratios were estimated using model 4 with normal corrected and ionized calcium group as reference. Low ionized calcium levels despite normal corrected calcium levels (hidden hypocalcemia) was a significant risk for the primary outcome, while low ionized calcium levels and low corrected calcium levels (apparent hypocalcemia) was not. Since there was only 1 patient with normal ionized and low corrected calcium, adjusted hazard ratio in this group is not shown.