. Author manuscript; available in PMC: 2012 Feb 1.

Published in final edited form as: J Pediatr. 2010 Sep 19;158(2):215–220. doi: 10.1016/j.jpeds.2010.08.007

Table 2.

Results of the regression model fitting

Models	Variables	Beta	SE	P
Base model	Age	−0.0122	0.0065	0.062
	Sex	0.0438	0.0161	0.007
	Race	0.0405	0.0165	0.014
VPA model^#	VPA	−0.0223	0.0197	0.257
	VPA×Age	0.0007	0.0012	0.544
	VPA×Sex	0.0086	0.0035	0.013
	VPA×Race	0.00076	0.002559	0.765

Sample size for VPA is 579.