Table 1.
Descriptive statistics for the entire sample and for the presence/absence of possible ADHD.
| Characteristic | Total (N = 3,500) | Possible ADHD (N = 190) | Non-ADHD (N = 3310) | P-value | Effect size |
|---|---|---|---|---|---|
| Gender (%male) | 56.5 | 52.6 | 56.7 | < 0.001 | 0.02 |
| Age (years) mean (SD) | 48.1 (13.2) | 39.4 (11.9) | 48.6 (13.1) | < 0.001 | 0.70 |
| ASRS mean (SD) | 7.4 (4.1) | 16.1 (2.6) | 6.9 (3.5) | < 0.001 | 2.63 |
| IAT mean (SD) | 38.1 (14.8) | 60.1 (18.8) | 36.9 (13.5) | < 0.001 | 1.68 |
| HFS mean (SD) | 21.2 (5.8) | 28.3 (6.0) | 20.8 (5.5) | < 0.001 | 1.36 |
The unpaired t-test was used to compare continuous variables between the two groups. Pearson's chi-square test was used to compare categorical variables between the two groups.
ADHD, attention-deficit/hyperactivity disorder; ASRS, Adult ADHD Self-Report Scale; IAT, Internet Addiction Test; HFS, Hyperfocus Scale; SD, standard deviation.