Table 4. Characteristics of patients readmitted with and without hyponatremia.

		Hyponatremia
Factor		Without	With	p -Value a
n ( n %)		392 (95.8%)	17 (4.2%)
Admission age, y (mean ± SD)		53.9 ± 16.5	52.4 ± 15.8	0.70
Sex (female)		207 (52.8%)	12 (70.6%)	0.15
Race	White	248 (63.4%)	14 (82.4%)	<0.001
	African American	81 (20.7%)	1 (5.9%)
	Other	63 (16.0%)	2 (11.8%)
BMI (mean ± SD)		29.9 ± 6.8	29.4 ± 5	0.81
Pathology	Nonfunctioning	263 (69.6%)	12 (75%)	0.98
	ACTH	42 (11.1%)	2 (12.5%)
	GH	32 (8.5%)	1 (6.2%)
	Prolactinoma	30 (7.9%)	1 (6.2%)
Tumor size, mm (mean ± SD)		22.6 ± 12.1	20.5 ± 11.4	0.52
Length of stay, d (mean ± SD)		2.8 ± 2.1	2.6 ± 1.1	0.81
Days to readmission (mean ± SD)		10.6 ± 10.9	4.3 ± 2.2	0.032
POD to readmission (mean ± SD)		13.7 ± 11.5	7.0 ± 2.1	0.028
Extrasellar extension		292 (74.5%)	10 (58.9%)	0.22
Intraoperative CSF leak
	No leak	182 (46.4%)	9 (52.9%)	0.78
	Low-flow leak	148 (37.8%)	5 (29.4%)
	High-flow leak	62 (15.8%)	3 (17.6%)
Seller repair
	Any repair	333 (84.9%)	13 (76.5%)	0.34
	Alloderm	311 (79.3%)	13 (76.5%)	0.78
	Amnion	81 (20.7%)	2 (11.8%)	0.37
	Nasoseptal flap	49 (12.5%)	1 (5.9%)	0.41
Postoperative CSF leak		7 (1.8%)	1 (5.9%)	0.48
Postoperative lumbar drain		13 (3.3%)	1 (5.9%)	0.57
Postoperative diabetes Insipidus		177 (45.5%)	6 (35.3%)	0.41
Inpatient endocrine consult		326 (83.2%)	14 (87.5%)	0.65
Outpatient endocrine follow-up		270 (68.9%)	10 (58.8%)	0.38
Type of outpatientendocrinologist
	Private	130 (33.2%	4 (23.5%)	0.61
	Institution	140 (35.7%)	6 (35.3%)
	None	122 (31.1%)	7 (41.2%)

Abbreviations: ACTH, adrenocorticotropic hormone; BMI, body mass index; CSF, cerebrospinal fluid; GH, growth hormone; POD, postoperative day; SD, standard deviation.

^a Reflects two-tailed t -test for continuous or Pearson's Chi-square/Fischer's exact test to compare categorical data between groups.

Note: Values are presented as number (%) unless otherwise indicated.