Table 3.
Mean (SD) factor scores within ADHD diagnostic groups
| Factor | Controls | Case definition | ||||
|---|---|---|---|---|---|---|
| Any ADHD disorder | Combined ADHD | Inattentive ADHD | Hyperactive‐impulsive ADHD | |||
| 1 | Mean (SD) | 0.0 (0.9) | 0.2 (1.3) | 0.2 (0.7) | 0.3 (2.3) | 0.0 (0.7) |
| N | n = 120 | n = 16 | n = 8 | n = 5 | n = 3 | |
| OR (95% CI) | 1.1 (0.6, 2.0) | 1.0 (0.4, 2.4) | 1.4 (0.5, 4.1) | 1.0 (0.3, 4.3) | ||
| p | p = 0.892 | p = 1.000 | p = 0.647 | p = 1.000 | ||
| 2 | Mean (SD) | −0.1 (1.1) | −0.1 (1.0) | 0.2 (0.7) | −0.4 (1.5) | −0.3 (1.3) |
| N | n = 118 | n = 16 | n = 8 | n = 5 | n = 3 | |
| OR (95% CI) | 0.9 (0.6, 1.6) | 1.2 (0.6, 3.1) | 0.8 (0.4, 2.0) | 0.8 (0.3, 2.9) | ||
| p | p = 0.702 | p = 0.859 | p = 0.525 | p = 0.553 | ||
| 3 | Mean (SD) | −0.1 (1.0) | −0.1 (1.2) | −0.2 (0.5) | 0.3 (1.9) | −0.3 (1.4) |
| N | n = 118 | n = 16 | n = 8 | n = 5 | n = 3 | |
| OR (95% CI) | 1.0 (0.6, 1.8) | 0.9 (0.4, 2.0) | 1.6 (0.6, 4.8) | 0.8 (0.2, 2.7) | ||
| p | p = 1.000 | p = 0.707 | p = 0.387 | p = 0.561 | ||
For each diagnosis, sex‐adjusted odds ratios (ORs) associated with a one SD difference in factor score are presented, with 95% confidence intervals (CIs) and p‐values estimated by exact logistic regression. Each factor score was calculated as the sum of the z‐scores (standardized to have mean = 0 and SD = 1) of the variables with factor loadings > 0.6 (Table 2).