Table 1.
Characteristics of the Study Population in the Quebec Longitudinal Study of Child Development (QLSCD)
| Wave 1 |
Wave 2 |
Wave 3 |
Wave 4 |
Wave 5 |
||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Mean (± SD) | n | Mean (± SD) | n | Mean (± SD) | n | Mean (± SD) | n | Mean (± SD) | n | |
| Sex, Male, n (%) | 772 (48.2%) | 1601 | ||||||||
| Age, Years | 7.15 (± 0.25) | 1468 | 8.15 (± 0.26) | 1421 | 10.15 (± 0.26) | 1295 | 12.14 (± 0.25) | 1353 | 13.14 (± 0.26) | 1252 |
| ADHD Medication, n (%) | 56 (3.8%) | 1468 | ||||||||
| SES | −0.01 (± 1.00) | 1467 | ||||||||
| ADHD Total Score | 2.64 (± 2.56) | 1303 | 2.55 (± 2.43) | 1267 | 2.31 (± 2.37) | 986 | 2.13 (± 2.21) | 1004 | 2.52 (± 2.56) | 992 |
| H-I Score | 2.05 (± 2.52) | 1302 | 1.90 (± 2.40) | 1266 | 1.62 (± 2.33) | 986 | 1.39 (± 2.09) | 999 | 1.48 (± 2.39) | 937 |
| IN Score | 3.79 (± 3.39) | 1303 | 3.77 (± 3.32) | 1281 | 3.63 (± 3.27) | 987 | 3.57 (± 3.32) | 1004 | 3.76 (± 3.25) | 1023 |
| Sleep Disturbance | 0.23 (± 0.25) | 1601 | 0.26 (± 0.25) | 1601 | 0.32 (± 0.24) | 1062 | 0.29 (± 0.22) | 1188 | 0.28 (0.22) | 832 |
Descriptive statistics are reported as mean (± SD) unless noted otherwise.
ADHD, attention-deficit/hyperactivity disorder; H-I, hyperactivity-impulsivity; IN, inattention; SES, socioeconomic status.