Table 2.
Comparison of characteristics between children 8 to 15 years not included and included in the analytic sample
| Not included
|
Included
|
|||
|---|---|---|---|---|
| Total no. | No. (weighted %) | Total no. | No. (weighted %) | |
| Sex (males) | 4,578 | 2,247 (51.2%) | 1,139 | 570 (53.2%) |
| Race/ethnicity | 4,578 | 1,139 | ||
| Non Hispanic white | 1,138 (59.6%) | 325 (63.3%) | ||
| African American | 1,533 (16.0%) | 342 (13.2%) | ||
| Mexican American | 1,555 (11.7%) | 382 (11.6%) | ||
| Other/multiracial | 352 (12.7%) | 90 (12.0%) | ||
| Poverty-income ratio | 4,145 | 1,139 | ||
| <1.0 | 1,390 (23.4%) | 363 (21.4%) | ||
| 1.0–1.84 | 1,009 (20.7%) | 274 (21.3%) | ||
| 1.85–3.0 | 730 (20.6%) | 214 (21.6%) | ||
| >3.0 | 1,016 (35.3%) | 288 (35.8%) | ||
| Maternal smoking during pregnancy | 4,509 | 697 (19.8%) | 1,125 | 152 (17.7%) |
| ADHD cases any subtype | 2,859 | 295 (12.2%) | 1,139 | 119 (12.1%) |
| ADHD cases Inattentive subtype | 2,865 | 133 (5.9%) | 1,139 | 69 (7.6%) |
| ADHD cases Hyperactive subtype | 2,860 | 81 (3.2%) | 1,139 | 21 (1.5%) |
| ADHD cases Combined subtype | 2,865 | 81 (3.1%) | 1,139 | 29 (3.0%) |
|
| ||||
| Total no. | Weighted mean (SE) | Total no. | Weighted mean (SE) | |
| Age (months) | 4,578 | 144 (0.6) | 1,139 | 143 (1.0) |
| Body mass index | 4,502 | 20.8 (0.1) | 1,139 | 20.6 (0.2) |
| Blood lead (ug/dL) | 4,036 | 1.4 (0.04) | 1,093 | 1.4 (0.04) |
| Maternal age at birth | 4,432 | 26.3 (0.2) | 1,107 | 26.4 (0.3) |
Abbreviations: ADHD, attention deficit/hyperactivity disorder; SE, standard error.