Table 2.

Health care utilization following Kawasaki disease diagnosis

Type of health care utilization		0–1 year following diagnosis		1–5 years following diagnosis		5+ years following diagnosis
		KD Case	Comparator	KD Case	Comparator	KD Case	Comparator
Hospital admissions	N	N=4,597	N=459,700	N=4,576	N=446,620	N=3,571	N=334,460
	Patients with ≥1 encounter	717 (15.6%)	12,140 (2.6%)	441 (9.6%)	22,418 (5.0%)	463 (13.0%)	33,496 (10.0%)
	Encounter rate (per 1000py)	210.3	35.4	45.4	21.1	28.3	20.7
	Adjusted rate ratio (95% CI)	5.68 (5.57–5.78)	Ref	1.64 (1.52–1.76)	Ref	1.15 (1.04–1.26)	Ref
Outpatient visits	N	N=4,597	N=459,700	N=4,576	N=446,620	N=3,571	N=334,460
	Patients with ≥1 encounter	4,587 (99.8%)	393,683 (85.6%)	4,447 (97.2%)	404,126 (90.5%)	3,389 (94.9%)	296,710 (88.7%)
	Encounter rate (per 1000py)	13,131.5	5,658.7	6,329.3	4,206.0	4,743.6	3,778.4
	Adjusted rate ratio (95% CI)	1.92 (1.89–1.94)	Ref	1.18 (1.16–1.21)	Ref	1.10 (1.06–1.13)	Ref
ED visits	N	N=3,723	N=372,141	N=3,709	N=363,349	N=2,727	N=257,503
	Patients with ≥1 encounter	1,695 (45.5%)	105,297 (28.3%)	2,129 (57.4%)	171,122 (47.1%)	1,668 (61.2%)	139,141 (54.0%)
	Encounter rate (per 1000py)	877.0	486.6	492.1	349.7	358.0	314.3
	Adjusted rate ratio (95% CI)	1.52 (1.46–1.58)	Ref	1.20 (1.16–1.25)	Ref	1.07 (1.01–1.12)	Ref

Ref: reference group, for calculation of adjusted rate ratio.