Table 1.

Patient characteristics in the four groups

Patients characteristics	Gender	Age, Years	Weight, kg	Size, m	BMI, kg/m2	P Creat μmol/L	CKD-EP mL/min/1.73m2	Diagnosis
Group l: Central diabetes insipidus
Patient 1	M	34	99	1.77	31.6	120	68	Central diabetes insipidus (Histiocytosis)
Patient 2	F	62	82	1.67	29.4	96	55	Partial central diabetes insipidus
Patient 3	M	14	47	1.69	16.5	43	165	Central diabetes insipidus (Pituitary Adenoma)
Patient 4	F	24	66	1.76	21.3	88	79	Central diabetes insipidus
Group 2: Nephrogenic diabetes insipidus
Patient 5	M	69	72	1.67	25.8	91	72	Nephrogenic diabetes insipidus (Lithium)
Patient 6	M	21	56	1.7	19.4	102	90	Nephrogenic diabetes insipidus
Patient 7	F	34	68	1.67	24.4	113	55	Nephrogenic diabetes insipidus
Patient 8	F	31	57	1.48	26.0	62	116	Nephrogenic diabetes insipidus
Group 3: Normal response to dilution
Patient 9	M	74	61	1.69	21.4	85	77	Past history of SIADH
Patient 10	M	51	66	1.74	21.8	52	117	Past history of SIADH
Patient 11	F	27	51	1.67	18.3	69	104	Past history of water intoxication
Patient 12	F	37	94	1.67	33.7	56	115	Past history of SIADH
Group4:SIADH
Patient 13	M	75	89	1.77	28.4	90	72	SIADH
Patient 14	M	67	84	1.67	30.1	83	84	SIADH
Patient 15	F	74	53	1.45	25.2	68	76	SIADH
Patient 16	F	67	72	1.57	29.2	104	48	SIADH (partial response)
Patient 17	M	73	60	1.65	22.0	66	100	SIADH (partial response)
Patient 18	M	81	63	1.59	24.9	84	75	SIADH (partial response)

BMI, body mass index, CKD-EPI, chronic kidney disease – epidemiology collaboration formula; SIADH, syndrome of inappropriate antidiuretic hormone secretion.