Table 1.

Baseline clinical characteristics of 822 infants with prenatally detected nephrouropathies

	N (%)
Sex
male	557 (67.8)
female	265 (32.2)
Laterality—fetal ultrasonography
unilateral	491 (59.7)
bilateral	331 (40.3)
Period
1989–1999	273 (33.2)
2000–2009	549 (66.8)
Fetal ultrasonography findings
unilateral hydronephrosis	355 (43.2)
bilateral hydronephrosis	263 (32.0)
cystic kidneys	97 (11.8)
hydronephrosis + megaureter	49 (6.0)
hydronephrosis + megaureter + urinary tract alterations	45 (5.5)
others	13 (1.5)
Postnatal diagnosis
idiopathic hydronephrosis	308 (37.5)
ureteropelvic junction obstruction	157 (19.1)
multicystic dysplastic kidney	89 (10.8)
vesicoureteral reflux	67 (8.2)
primary megaureter	60 (7.3)
posterior urethral valves	46 (5.6)
ureterocele	28 (3.4)
hypodysplastic kidney	20 (2.4)
prune belly syndrome	10 (1.2)
others	38 (4.6)