Table 3.
Adjusted Current Asthma Prevalencea Among Youth 2–19 Years of Age with Decomposition Analysisb of Racial/Ethnic Disparity, United States, 1988–1994 and 2011–2014
| 1988–1994 | 2011–2014 | |
|---|---|---|
| n | 5845 | 3224 |
| NH black | 8.4** | 18.0** |
| NH white | 7.2** | 10.3** |
| Overall difference | 1.2 | 7.7** |
| Endowment | 0.0 | 1.7 |
| Effect | 1.5 | 5.4** |
| Interaction | −0.3 | 0.6 |
| Endowment (difference in prevalence due to varying characteristics between time periods) | ||
| Weight status | −0.2 | 0.0 |
| Age group | 0.0 | 0.0 |
| Sex | 0.0 | 0.0 |
| Income status | 0.2 | 1.7* |
| Effect (difference in prevalence due to impact of characteristic on risk for asthma) | ||
| Weight status | 0.4 | −2.6* |
| Age group | −0.5* | −0.9 |
| Sex | 0.1 | 0.0 |
| Income status | −0.2 | 0.2 |
| Intercept | 1.7 | 8.6** |
P<0.05,
P<0.001 for one or more individual variable categories
FIPR= family income to poverty ratio; NH=non-Hispanic
Asthma prevalence estimates adjusted for covariates shown in the table. Results are rounded to nearest tenth percent, and therefore sums may differ due to rounding.
The prevalence estimates for endowment, effect, and interaction components sum to the overall difference in asthma prevalence between NH black and NH white youth in each period. The endowment contributions for all variables sum to the overall endowment component, and the effect contributions for all variables and the intercept sum to the overall effect component. Estimates of the interaction between explained and unexplained differences were also estimated for each variable (not shown) but were small and not statistically significant.