Table 1.

Standardized Primary and Secondary Factor Loadings

	SCT Factor	ADHD-IN Factor
Sluggish Cognitive Tempo Symptoms
1. Behavior is slow (e.g., sluggish)	0.92*	−0.02ns
2. Lost in a fog	0.89*	0.07*
3. Stares blankly into space	0.96*	−0.01ns
4. Drowsy or sleepy (yawns) during the day	0.95*	−0.01ns
5. Daydreams	0.88*	0.05ns
6. Loses train of thought	0.86*	0.09*
7. Low level of activity (e.g., underactive)	0.97*	−0.08ns
8. Gets lost in own thoughts	0.81*	0.12*
9. Easily tired or fatigued	1.02*	−0.09ns
10. Forgets what was going to say	0.94*	−0.02ns
11. Easily confused	0.91*	0.05ns
12. Lacks motivation to complete tasks (e.g., apathetic)	0.27*	0.68*
13. Spaces or zones out	0.82*	0.13*
14. Gets mixed up	0.85*	0.11*
15. Thinking is slow	0.87*	0.06ns
16. Difficulty expressing thoughts (e.g., gets “tongue-tied”)	0.78*	0.12*
ADHD-Inattention Symptoms
1. Close attention	0.16*	0.78*
2. Sustaining attention	0.04ns	0.93*
3. Listen	0.15*	0.77*
4. Follow through	0.03ns	0.93*
5. Organization	−0.15*	1.08*
6. Avoids tasks requiring sustained effort	0.01ns	0.93*
7. Loses things	−0.15*	1.08*
8. Easily distracted	−0.02ns	0.95*
9. Forgetful	0.13*	0.82*

Note. Each symptom was rated on a 6-point scale. The full Child and Adolescent Behavior Inventory (CABI) measure is available from the corresponding author. Partial standardized regression coefficients can be larger than one with cross-loadings and correlated factors. ADHD = attention-deficit/hyperactivity disorder. ADHD-IN = attention-deficit hyperactivity disorder inattention. SCT = sluggish cognitive tempo.

^*p < .05;

^ns= non-significant.