Table 1. Weighted Descriptive Analyses of the Dependent Variables1,2.
| FULL SAMPLE | MEXICAN-AMERICANS | NH BLACK | NH WHITE | |
|---|---|---|---|---|
|
| ||||
| Servings/Day of Fruit, n=13,310 (Mean, SD) | 1.53 (2.05) | 1.52(0.92) | 1.30(1.26) | 1.55(2.86) |
| ICC-Level 2 (%) | 15.6 | N/A | N/A | N/A |
| ICC-Level 3 (%) | 2.7 | |||
|
| ||||
| Servings/Day of Vegetables, n=13,296 (Mean, SD) | 3.24 (2.62) | 3.05(1.07) | 2.69(1.61) | 3.35(3.69) |
| ICC-Level 2 (%) | 16.9 | N/A | N/A | N/A |
| ICC-Level 3 (%) | 0.53 | |||
|
| ||||
| Combined Servings/Day of Fruit and Vegetables, n=13,281 (Mean, SD) | 4.76 (3.52) | 4.57 (3.40) | 3.99 (3.38) | 4.90 (3.53) |
| ICC-Level 2 (%) | 18.7 | N/A | N/A | N/A |
| ICC-Level 3 (%) | 1.5 | |||
1
Racial/Ethnic differences in group means are significant at P<0.05 (PROC TTEST) with the exception of Mexican-American fruit intake relative to that of Whites. SD=standard deviation.
2
ICCs = intra-class correlation coefficients, which provide an estimate of the proportion of total variance in dietary outcome that occurs between tracts within counties (level 2) and between counties (level 3). Unconditional hierarchical linear models (HLM), i.e. models with no independent variables, were estimated with PROC MIXED using SAS version 9.1 in order to derive unadjusted ICCs.
3
There is no significant clustering of observations at the county level for vegetable intake.