Table 1.
Descriptive Statistics for the Two Cohorts
| Demographic Factor | Cohort
|
|
|---|---|---|
| Older | Younger | |
| Child Sex (female) | 49% (1865) | 49% (1812) |
| Indigenous (yes) | 2% (86) | 2% (73) |
| Mom age | 34.75 (5.13; 19–52) | 31.38 (5.10; 16–48) |
| Mom education | 5.27 (1.03; 1–6) | 5.49 (.89; 1–6) |
| Family income | 10.59 (2.63; 1–15) | 10.44 (2.56; 1–15) |
| Single parent (yes) | 12% (473) | 7% (266) |
| Smoked during pregnancy (yes) | 18% (740) | 16% (709) |
| Number of SDQ assessments | ||
| Parent report1 | 5.16 (1.39; 1–6) | 3.56 (.81; 1–4) |
| Teacher report2 | 4.29 (1.39; 1–6) | 3.04 (.92; 1–4) |
| Self report3 | 2.71 (.59; 1–3) | 1 |
Note. N=3,841 for the older cohort and N=3,714 for the younger cohort. Numbers are either percentages (n) or means (standard deviations; range). SDQ=Strengths and Difficulties Questionnaire. Education ranges from 1 (never attended school) to 6 (Year 12 or equivalent). Income ranges from 1 (<$2600/year) to 15 (>$124,800).
Total parent assessments = 19,833 (n=3,841) and 13,239 (n=3,714) for the older and younger cohort, respectively.
Total teacher assessments = 16,028 (n=3,734) and 11,282 (n=3,714) for the older and younger cohort, respectively
Total self assessments = 9,267 (n=3,424) and 3,034 (n=3,034) for the older and younger cohort, respectively; the younger cohort only had a single self assessment on the SDQ