Table 2: Correlation coefficients ( -square) between selected component scores within each diet quality index.
(a) HEI 2005

ComponentsFruitsVegetablesTotal grainWhole grain

Total sample (N = 5,936)
Milk/dairy0.0891** 0.03170.0545*
Fruit 0.0711**0.0726**
Vegetables0.1017**
Total grains 0.3007**
Whole grains

2–5 year olds (N = 1,405)
Milk/dairy0.0027
Fruit 0.10790.1007**
Vegetables0.0603
Total grains 0.3833**
Whole grains

6–11 year olds (N = 1,586)
Milk/dairy0.0198−0.0676*
Fruit0.01830.1185*0.0722
Vegetables0.1267*0.0207
Total grains 0.3027**
Whole grains

12–18 year olds (N = 2,945)
Milk/dairy0.05310.00990.1157**0.1347**
Fruit 0.03110.0192
Vegetables0.0981**0.0015
Total grains 0.2661**
Whole grains

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

ComponentsFruitsVegetablesTotal grainWhole grain

Total sample (N = 5,936)
Milk/dairy0.1326**0.0938**0.2522**0.1585**
Fruit0.2025**0.1513**0.2274**
Vegetables0.2056**0.1070**
Total grains 0.2560**
Whole grains

2–5 year olds (N = 1,405)
Milk/dairy0.0312 0.0060
Fruit0.2165**0.07790.1881**
Vegetables0.1496**0.0454
Total grains 0.2203**
Whole grains

6–11 year olds (N = 1,586)
Milk/dairy0.08200.04880.2442**0.1980**
Fruit0.06320.0760*0.1738**
Vegetables0.1305**0.0491
Total grains 0.2510**
Whole grains

12–18 year olds (N = 2,945)
Milk/dairy0.05330.03620.2619**0.1092**
Fruit0.06760.0926*0.1469**
Vegetables0.1950**0.0427
Total grains 0.2067**
Whole grains

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