Table 1. . Some demographic and baseline data of three group of children.

Characteristics	Groups			p-value
	Group 1 (n = 19)	Group 2 (n = 38)	Group 3 (n = 29)
Age, months, mean ± SD	63 ± 37	59 ± 47	39 ± 22	0.27
Sex, F/M	16/3	35/3	23/6	0.32
VUR, n (%)	14 (74)	5 (22)	–	0.002
VUR severity, n (%):
– Mild	4 (28.6)	2 (0.4)	–	0.007
– Moderate	4 (28.6)	2 (0.4)	–	–
– Severe	6 (42.8)	1 (0.2)	–	–

APN: Acute pyelonephritis; VUR: Vesicoureteral reflux.