Examination of the Five Comparable Component Scores of the Diet Quality Indexes HEI-2005 and RC-DQI Using a Nationally Representative Sample of 2–18 Year Old Children: NHANES 2003–2006

Table 2

Correlation coefficients (𝑟-square) between selected component scores within each diet quality index.

(a) HEI 2005

Components	Fruits	Vegetables	Total grain	Whole grain
Total sample (N = 5,936)
Milk/dairy	0.0891**	−0.0288	0.0317	0.0545*
Fruit		−0.0359	0.0711**	0.0726**
Vegetables			0.1017**	−0.0006
Total grains				0.3007**
Whole grains
2–5 year olds (N = 1,405)
Milk/dairy	0.0027	−0.0085	−0.0176	−0.0254
Fruit		−0.0596	0.1079	0.1007**
Vegetables			0.0603	−0.0259
Total grains				0.3833**
Whole grains
6–11 year olds (N = 1,586)
Milk/dairy	0.0198	−0.0676*	−0.0164	−0.0033
Fruit		0.0183	0.1185*	0.0722
Vegetables			0.1267*	0.0207
Total grains				0.3027**
Whole grains
12–18 year olds (N = 2,945)
Milk/dairy	0.0531	0.0099	0.1157**	0.1347**
Fruit		−0.0481	0.0311	0.0192
Vegetables			0.0981**	0.0015
Total grains				0.2661**
Whole grains

(b) RC-DQI in the total sample and three mutually exclusive age groups

Components	Fruits	Vegetables	Total grain	Whole grain
Total sample (N = 5,936)
Milk/dairy	0.1326**	0.0938**	0.2522**	0.1585**
Fruit		0.2025**	0.1513**	0.2274**
Vegetables			0.2056**	0.1070**
Total grains				0.2560**
Whole grains
2–5 year olds (N = 1,405)
Milk/dairy	0.0312	−0.0047	−0.0024	0.0060
Fruit		0.2165**	0.0779	0.1881**
Vegetables			0.1496**	0.0454
Total grains				0.2203**
Whole grains
6–11 year olds (N = 1,586)
Milk/dairy	0.0820	0.0488	0.2442**	0.1980**
Fruit		0.0632	0.0760*	0.1738**
Vegetables			0.1305**	0.0491
Total grains				0.2510**
Whole grains
12–18 year olds (N = 2,945)
Milk/dairy	0.0533	0.0362	0.2619**	0.1092**
Fruit		0.0676	0.0926*	0.1469**
Vegetables			0.1950**	0.0427
Total grains				0.2067**
Whole grains

∗significant at P value < 0.05.
∗∗significant at P value < 0.01.