Table 2.
Standardized Primary and Secondary Factor Loadings (SEs)
| SCT Factor | ADHD-IN Factor | |
|---|---|---|
| Sluggish Cognitive Tempo Symptoms | ||
| 1. Behavior is slow (e.g., sluggish) | 0.92 (.01)* | −0.03 (.01)ns |
| 2. Lost in a fog | 0.94 (.01)* | 0.02 (.01)ns |
| 3. Stares blankly into space | 0.94 (.01)* | 0.01 (.01)ns |
| 4. Drowsy or sleepy (yawns) during the day | 1.08 (.01)* | −0.23 (.02)* |
| 5. Daydreams | 0.87 (.01)* | 0.06 (.01)* |
| 6. Loses train of thought | 0.78 (.01)* | 0.18 (.01)* |
| 7. Low level of activity (e.g., underactive) | 1.05 (.01)* | −0.21 (.02)* |
| 8. Gets lost in own thoughts | 0.81 (.01)* | 0.12 (.01)* |
| 9. Easily tired or fatigued | 1.13 (.02)* | −0.27 (.02)* |
| 10. Forgets what was going to say | 0.79 (.01)* | 0.13 (.02)* |
| 11. Easily confused | 0.73 (.01)* | 0.23 (.02)* |
| 12. Spaces or zones out | 0.81 (.01)* | 0.16 (.01)* |
| 13. Gets mixed up | 0.70 (.01)* | 0.27 (.02)* |
| 14. Thinking is slow | 0.72 (.01)* | 0.22 (.02)* |
| 15. Difficulty expressing thoughts (e.g., gets tongue-tied) | 0.65 (.02)* | 0.24 (.02)* |
| ADHD-Inattention Symptoms | ||
| 1. Close attention | 0.17 (.01)* | 0.78 (.01)* |
| 2. Sustaining attention | 0.08 (.01)* | 0.89 (.01)* |
| 3. Listen | 0.20 (.02)* | 0.72 (.02)* |
| 4. Follow through | 0.10 (.02)* | 0.87 (.01)* |
| 5. Organizational skills | −0.04 (.02)ns | 0.98 (.02)* |
| 6. Avoids tasks requiring sustained effort | 0.10 (.02)* | 0.83 (.02)* |
| 7. Loses things | −0.06 (.02)ns | 0.99 (.02)* |
| 8. Easily distracted | 0.00 (.00)ns | 0.93 (.01)* |
| 9. Forgetful | 0.23 (.02)* | 0.73 (.01)* |
Note. N = 7613. Each symptom was rated on a 6-point scale. The complete wording of the ADHD-IN items is available from the corresponding author. Partial standardized regression coefficients can be larger than one with cross-loadings and correlated factors. ADHD-IN = attention-deficit/hyperactivity disorder inattention. SCT = sluggish cognitive tempo.
*
p < .001;
ns = non-significant (p > .001).