Table 3. Mixed linear model analysis of factors predicting residual urine volume.

Variables	Model 1			Model 2
	Estimate	s.e.	P-value	Estimate	s.e.	P-value
Intercept	1125	104	<0.0001	1350	106	<0.0001
Time on PD (years)	−138	23	<.0001	−134	23.4	<0.0001
Underlying diagnosis (ref. CAKUT)
Glomerulopathies	−614	103	<0.0001	−584	101	<0.0001
Other	−395	145	0.007	−330	142	0.021
Use of diuretics	103	59	0.074	84	61	0.165
Use of biocompatible PD fluid	121	59	0.028	111	58	0.057
Use of icodextrin	−202	100	0.043	−179	103	0.083
Ultrafiltration volume (l/m2 per day)	−35	23	0.138	−42	24	0.077
Region of residence (ref: Europe)
North America				−431	215	0.047
Latin America				46	120	0.705
Turkey				−259	131	0.050
Asia				−420	153	0.007

Abbreviations: CAKUT, congenital anomalies of kidney and urinary tract; PD, peritoneal dialysis. Daily urine output per m² body surface area was used as the dependent variable in the model. Estimates denote ml/m² diuresis difference attributable to predictor variable (per one unit for quantitative variables).