Table 1.
Descriptive Statistics
| Variable | Overall mean (SE) / proportion (%) | Female mean (SE) / proportion (%) | Male mean (SE) / proportion (%) |
|---|---|---|---|
| ADHD | 1.97 (0.07) | 1.33 (0.08) | 2.53 (0.11) |
| Depression | 3.36 (0.12) | 3.85 (0.19) | 2.94 (0.16) |
| Presence of friends | 2.90 (0.01) | 2.93 (0.01) | 2.87 (0.02) |
| Stability: best friend | 39.6% | 42.1% | 37.5% |
| Stability: top three friends | 62.3% | 65.2% | 59.8% |
| Quality: best friend | 34.81 (0.21) | 37.14 (0.28) | 32.78 (0.30) |
| Quality: top three friends | 10.84 (0.04) | 10.81 (0.05) | 10.86 (0.05) |
| Classroom friendship group: total difficulties | 7.99 (0.20) | 7.18 (0.22) | 8.70 (0.24) |
| Classroom friendship group: cooperativeness | 0.51 (0.01) | 0.54 (0.01) | 0.47 (0.01) |
| Classroom friendship group: disruptiveness | 0.12 (0.005) | 0.07 (0.005) | 0.17 (0.01) |
| Number of people in classroom friendship group | 4.98 (0.07) | 4.59 (0.08) | 5.33 (0.10) |
n = 1712 (53.5% male), ADHD attention deficit/hyperactivity disorder, SE standard error