Table 2.

Baseline Conduction Abnormalities Stratified by Age. Frequency of conduction abnormalities stratified by age. Age stratifications based on those used in the NHS study

NHS baseline data (Criteria: Surawicz et al.)
	% of All ECGs (N = 106)	4–8 yr (n = 18)	9–16 yr (n = 40)	17–24 yr (n = 23)	25–56 yr (n = 25)
Conduction Abnormality	45.3%	72.2%	62.5%	8.7%	32.0%
Intraventricular Conduction Delay	37.7%	72.2%	47.5%	16.7%	24.0%
Right Bundle Branch Block	4.7%	0%	12.5%	0%	0%
Incomplete Right Bundle Branch Block	1.9%	0%	2.5%	0%	4.0%
First Degree AV Block	0.9%	0%	0%	0%	4.0%

IVCD Intraventricular conduction delay, RBBB right bundle branch block, IRBBB Incomplete right bundle branch block