Table 3.

Univariate analysis

Univariate analysis	Hyponatraemia
Variables	OR, 95% CI		P value
Age <12 months	3.24	2.7 to 5.3	<0.01
Age 12–24 months	2.13	0.8 to 9.3	0.75
Age >24 months	1.24	0.4 to 5.9	0.46
Male	1.75	1.0 to 2.6	0.02
After thorax surgery	0.52	0.3 to 1.7	0.07
After neurosurgery	2.01	0.7 to 4.7	0.06
After abdominal surgery	2.03	1.9 to 4.5	0.01
Convulsive syndrome	1.47	0.8 to 4.7	0.07
Acute infectious respiratory disease	2.34	1.1 to 5.2	0.05
Asthma	0.56	0.3 to 12.1	0.78
Treatment with chemotherapy (oncological and transplanted patients of bone marrow)	0.65	0.2 to 1.8	0.06