Table 2.

Percentage (95% CI) with prescriptions for children born with congenital hydronephrosis and multicystic kidney dysplasia by age groups, compared to children from the same populations without congenital anomalies (reference children)

	Age (completed years)	Congenital hydronephrosis		Multicystic kidney dysplasia		Reference children
		Number	% with a prescription during the year (95% CI)	Number	% with a prescription during the year (95% CI)	Number	% with a prescription during the year (95% CI)
Antibiotics	< 1	3026	76 (73–79)	621	67 (63–71)	1,722,912	44 (40–48)
	1	2999	70 (68–72)	613	69 (62–76)	1,710,136	57 (52–62)
	2	2681	60 (59–62)	558	57 (48–65)	1,542,220	50 (46–55)
	3	2350	59 (55–63)	493	52 (44–59)	1,376,969	49 (44–53)
	4	2082	52 (45–58)	426	44 (35–53)	1,205,677	42 (39–46)
	5	1802	41 (36–46)	373	38 (31–46)	1,035,937	35 (31–39)
	6	1526	35 (29–41)	327	33 (25–42)	864,038	30 (26–34)
	7	1286	24 (17–32)	273	29 (23–34)	739,063	22 (18–27)
	8	1071	29 (26–32)	218	27 (21–33)	614,519	22 (19–25)
	9	916	26 (22–29)	187	24 (12–38)	532,411	20 (18–23)
Antihypertensive	< 1	3026	0.21 (0.07–0.41)	621	0.55 (0.09–1.32)	1,722,912	0.02 (0.01–0.03)
	1	2999	0.35 (0.17–0.60)	613	0.32 (0.00–0.97)	1,710,136	0.01 (0.01–0.02)
	2	2681	0.46 (0.23–0.75)	558	0.39 (0.01–1.13)	1,542,220	0.01 (0.01–0.02)
	3	2350	0.42 (0.19–0.72)	493	0.69 (0.11–1.66)	1,376,969	0.01 (0.00–0.02)
	4	2082	0.47 (0.22–0.82)	426	0.84 (0.15–1.98)	1,205,677	0.01 (0.01–0.02)
	5	1802	0.46 (0.19–0.83)	373	0.50 (0.00–1.54)	1,035,937	0.02 (0.01–0.02)
	6	1526	0.34 (0.10–0.71)	327	0.70 (0.03–1.98)	864,038	0.02 (0.01–0.03)
	7	1286	0.56 (0.21–1.05)	273	1.34 (0.25–3.12)	739,063	0.02 (0.01–0.03)
	8	1071	0.72 (0.28–1.32)	218	1.21 (0.10–3.20)	614,519	0.02 (0.01–0.04)
	9	916	0.51 (0.13–1.10)	187	1.41 (0.12–3.72)	532,411	0.02 (0.01–0.03)