Table 2.

Visit and Testing Rates

Variable	IR (95% CI)*		IRR (95% CI)*	P value
	<10 y	10–18 y	10–18 y vs <10 y
Visits
Emergency department	0.47 (0.39–0.56)	0.34 (0.30–0.38)	0.71 (0.58–0.87)	0.0010
Admissions	0.09 (0.06–0.12)	0.13 (0.11–0.15)	1.46 (1.03–2.09)	0.035
Cardiology	0.20 (0.17–0.23)	0.40 (0.35–0.45)	2.00 (1.66–2.40)	<0.001
Tests
Echocardiogram/MRI	0.42 (0.37–0.47)	0.66 (0.62–0.70)	1.59 (1.40–1.80)	<0.001
ECG	0.37 (0.34–0.41)	0.63 (0.58–0.67)	1.68 (1.50–1.89)	<0.001
Holter monitoring	0.04 (0.03–0.06)	0.14 (0.12–0.16)	3.33 (2.35–4.73)	<0.001

The unit of IR is per person per year. IR indicates incidence rate; IRR, IR ratio; and MRI, magnetic resonance imaging.

^*Estimates adjusted for follow‐up time.