Table 3. Unfavorable outcome comparison between age and comorbidity groups.

Group	Unfavorable outcome	p value*
Infants vs. others	7/25 vs. 3/6	0.358
HCMP vs. others	3/5 vs. 7/26	0.296
Structural heart disease vs. others	6/13 vs. 4/18	0.247
Pulmonary disease vs. others	4/7 vs. 6/24	0.172
Syndrome vs. others	4/6 vs. 6/25	0.067
Further arrhythmia vs. others	2/4 vs. 8/27	0.577
Major comorbidity vs. idiopathic	9/20 vs. 1/11	0.055
Idiopathic infants vs. others	0/10 vs. 10/21	0.008

HCMP = hypertrophic cardiomyopathy.

^*Fisher's exact test.