Influence of hypocalcemia on the prognosis of patients with multiple trauma

Table 1 Comparison of general and clinical data between two groups of patients

Indicators	Low blood calcium group (n = 81)	Normal blood calcium group (n = 18)	χ2/t	P value
Sex (Male/Female), cases (%)	54 (66.67)/27 (33.33)	16 (88.89)/2 (11.11)	3.511	0.061
Age (yr)	58.19 ± 16.24	51.83 ± 19.16	1.452	0.150
Blood calcium (mmol/L)	1.84 ± 0.15	2.18 ± 0.08	-13.922	< 0.001
HCT	0.26 ± 0.06	0.32 ± 0.06	-4.232	< 0.001
APACHE II (points)	17.93 ± 9.55	8.89 ± 4.99	5.702	< 0.001
SOFA (points)	7.84 ± 3.80	4.39 ± 3.22	3.575	0.001
Duration of mechanical ventilation (h)	70.16 (33.38-143.28)	20.63 (0-57.23)	-3.124	0.002
Length of ICU stay (d)	5 (3-9)	4 (2-6.25)	-1.954	0.051

HCT: Hematocrit; APACHE II: Acute Physiology and Chronic Health Evaluation II; SOFA: Sequential Organ Failure Assessment; ICU: Intensive care unit.

Table 2 Comparison of 28 days survival prognosis between hypocalcemia and normocalcemia groups

Group	Number of cases	28 days survival prognosis
		Deaths	Survival
Hypocalcemia group	81	20	61
Normocalcemic group	18	0	18
χ2 value		4.143
P value		0.042

Table 3 Correlation of blood calcium values with each index in patients with multiple injuries

Indicators	Blood calcium		Indicators	Blood calcium
	r value	P value		r value	P value
APACHE II	-0.361	< 0.001	HCT	0.403	< 0.001
SOFA	-0.336	0.010	Duration of mechanical ventilation	-0.188	0.650

HCT: Hematocrit; APACHE II: Acute Physiology and Chronic Health Evaluation II; SOFA: Sequential Organ Failure Assessment.