Table 2. Descriptive statistics for unstandardized and standardized dependent variables.
Population sample of compulsory school graduates from years 2002–2011 and the ADHD sample.
| Population sample | ADHD sample | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Treatment sample | Placebo sample | ||||||||
| Mean | SD | N | Mean | SD | N | Mean | SD | N | |
| Unstandardized variables | |||||||||
| Exam GPA | 6.23 | 2.22 | 571107 | 4.81* | 2.09 | 2659 | 4.71* | 1.98 | 3785 |
| Teacher Evaluation GPA | 6.34 | 2.22 | 571107 | 4.72* | 2.05 | 2659 | 4.64* | 2.00 | 3785 |
| Standardized variables | |||||||||
| Exam GPA | 0.00 | 1.00 | 571107 | -0.64* | 0.94 | 2659 | -0.69* | 0.90 | 3785 |
| Teacher Evaluation GPA | 0.00 | 1.00 | 571107 | 0.73* | 0.92 | 2659 | -0.77* | 0.90 | 3785 |
Source: Own calculations on data from Statistics Denmark.
* indicates that the mean of the ADHD sample is significantly different from the population sample mean at the 5 percent level of signification (estimated from t-tests). GPA: Grade point average. Unweighted data. Treatment sample: Children who begin medical ADHD treatment prior to compulsory school graduation. Placebo sample: Children who begin medical ADHD treatment after compulsory school graduation.