Table 8.
Characteristics of participants included in meta‐analysis
|
Population's characteristics |
||
|---|---|---|
|
Study average age |
mean 12.9 |
standard deviation 2.8 |
|
Grade |
frequency |
% |
|
Elementary school |
11 |
29.7 |
|
Middle school |
16 |
43.2 |
|
High school |
8 |
21.6 |
|
Mixture of levels |
2 |
5.4 |
|
|
||
|
Ethnicity |
mean | standard deviation |
|
% Black or Afro‐American |
54.1 |
37.2 |
|
% White |
24.6 |
27.9 |
|
% Latino |
20.2 |
25.5 |
|
|
|
|
|
Free school meals |
mean | standard deviation |
|
|
66.2 |
23.9 |
Note. Means and standard deviations are calculated at study level.