Table 2.
Pattern matrix of PCA loadings of SCQ and SWAN items in combined sample
| Items | DSM-IV sub-domains | Component 1-SOC/COM | Component 2-RRBI | Component 3-INA | Component 4-HYP/IMP |
|---|---|---|---|---|---|
| SCQ 28—show things to engage interest (4/5) | SOC | 0.91 | |||
| SCQ 20—talk to be friendly (4/5) | COM | 0.80 | |||
| SCQ 27—reciprocates smiles (4/5) | SOC | 0.80 | |||
| SCQ 29—shares things (4/5) | SOC | 0.79 | |||
| SCQ 24—nod head (4/5) | COM | 0.78 | |||
| SCQ 35—pretend play (4/5) | COM | 0.77 | |||
| SCQ 22—points to show things (4/5) | COM | 0.77 | |||
| SCQ 31—comforts others (4/5) | SOC | 0.77 | |||
| SCQ 32—use gestures with sounds or words (4/5) | SOC | 0.77 | |||
| SCQ 2—has to and fro conversation | COM | 0.76 | |||
| SCQ 33—normal range of facial expressions (4/5) | SOC | 0.75 | |||
| SCQ 36—interested in other children (4/5) | SOC | 0.75 | |||
| SCQ 37—positive response to other children (4/5) | SOC | 0.72 | |||
| SCQ 34—joins in social games (4/5) | COM | 0.71 | |||
| SCQ 21—spontaneously copies others actions (4/5) | COM | 0.70 | |||
| SCQ 40—plays cooperatively with others (4/5) | SOC | 0.67 | 0.32 | ||
| SCQ 26—looks at faces (4/5) | SOC | 0.59 | |||
| SCQ 38—pays attention without name being called (4/5) | SOC | 0.55 | 0.36 | ||
| SCQ 19—has friends | SOC | 0.53 | |||
| SCQ 11—odd interests | RRB | 0.79 | |||
| SCQ 13—intense interests | RRB | 0.75 | |||
| SCQ 18—has to carry around specific object | RRB | 0.74 | |||
| SCQ 12—interested in parts of objects | RRB | 0.73 | |||
| SCQ 14—unusual sensory interests | RRB | 0.70 | |||
| SCQ 6—makes up words | COM | 0.70 | |||
| SCQ 3—uses odd phrases | RRB | 0.68 | |||
| SCQ 15—odd movements | RRB | 0.65 | |||
| SCQ 10—uses other’s hand as tool | SOC | 0.64 | |||
| SCQ 16—repetitive complicated movements | RRB | 0.64 | |||
| SCQ 8—has rituals | RRB | 0.63 | |||
| SCQ 5—mixes up pronouns | COM | 0.62 | |||
| SCQ 4—asks socially inappropriate questions | SOC | 0.60 | |||
| SCQ 17—engages in self-harm | RRB | 0.44 | |||
| SWAN 14—control constant activity | HYP/IMP | 0.82 | |||
| SWAN 13—plays quietly | HYP/IMP | 0.79 | |||
| SWAN 17—awaits turn | HYP/IMP | 0.79 | |||
| SWAN 15—controls excess talking | HYP/IMP | 0.77 | |||
| SWAN 16—controls blurting out answering | HYP/IMP | 0.77 | |||
| SWAN 10—sits still | HYP/IMP | 0.67 | |||
| SWAN 12—modulates motor activity | HYP/IMP | 0.65 | |||
| SWAN 5—organizes tasks | INA | 0.85 | |||
| SWAN 7—loses things | INA | 0.81 | |||
| SWAN 4—follows through on instructions | INA | 0.73 | |||
| SWAN 9—forgetfulness | INA | 0.69 | |||
| SWAN 6—engages in tasks requiring mental effort | INA | 0.69 | |||
| SWAN 1—attention to detail | INA | 0.69 | |||
| SWAN 2—sustains attention | INA | 0.61 | |||
| SWAN 3—listens when spoken to | INA | 0.46 | 0.35 | ||
| SWAN 8—easily distracted | INA | 0.38 |
Component loadings above 0.3 are shown
ADHD attention-deficit/hyperactivity disorder, ASD autism spectrum disorder, SCQ social communication questionnaire, SWAN strengths and weaknesses of ADHD symptoms and normal behavior questionnaire, RRBI restricted repetitive behaviors and interests, INA inattention, HYP/IMP hyperactivity/impulsivity