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Table 2 Pattern matrix of PCA loadings of SCQ and SWAN items in combined sample

From: Inattention and hyperactive/impulsive component scores do not differentiate between autism spectrum disorder and attention-deficit/hyperactivity disorder in a clinical sample

ItemsDSM-IV sub-domainsComponent 1-SOC/COMComponent 2-RRBIComponent 3-INAComponent 4-HYP/IMP
SCQ 28—show things to engage interest (4/5)SOC0.91   
SCQ 20—talk to be friendly (4/5)COM0.80   
SCQ 27—reciprocates smiles (4/5)SOC0.80   
SCQ 29—shares things (4/5)SOC0.79   
SCQ 24—nod head (4/5)COM0.78   
SCQ 35—pretend play (4/5)COM0.77   
SCQ 22—points to show things (4/5)COM0.77   
SCQ 31—comforts others (4/5)SOC0.77   
SCQ 32—use gestures with sounds or words (4/5)SOC0.77   
SCQ 2—has to and fro conversationCOM0.76   
SCQ 33—normal range of facial expressions (4/5)SOC0.75   
SCQ 36—interested in other children (4/5)SOC0.75   
SCQ 37—positive response to other children (4/5)SOC0.72   
SCQ 34—joins in social games (4/5)COM0.71   
SCQ 21—spontaneously copies others actions (4/5)COM0.70   
SCQ 40—plays cooperatively with others (4/5)SOC0.670.32  
SCQ 26—looks at faces (4/5)SOC0.59   
SCQ 38—pays attention without name being called (4/5)SOC0.550.36  
SCQ 19—has friendsSOC0.53   
SCQ 11—odd interestsRRB 0.79  
SCQ 13—intense interestsRRB 0.75  
SCQ 18—has to carry around specific objectRRB 0.74  
SCQ 12—interested in parts of objectsRRB 0.73  
SCQ 14—unusual sensory interestsRRB 0.70  
SCQ 6—makes up wordsCOM 0.70  
SCQ 3—uses odd phrasesRRB 0.68  
SCQ 15—odd movementsRRB 0.65  
SCQ 10—uses other’s hand as toolSOC 0.64  
SCQ 16—repetitive complicated movementsRRB 0.64  
SCQ 8—has ritualsRRB 0.63  
SCQ 5—mixes up pronounsCOM 0.62  
SCQ 4—asks socially inappropriate questionsSOC 0.60  
SCQ 17—engages in self-harmRRB 0.44  
SWAN 14—control constant activityHYP/IMP   0.82
SWAN 13—plays quietlyHYP/IMP   0.79
SWAN 17—awaits turnHYP/IMP   0.79
SWAN 15—controls excess talkingHYP/IMP   0.77
SWAN 16—controls blurting out answeringHYP/IMP   0.77
SWAN 10—sits stillHYP/IMP   0.67
SWAN 12—modulates motor activityHYP/IMP   0.65
SWAN 5—organizes tasksINA  0.85 
SWAN 7—loses thingsINA  0.81 
SWAN 4—follows through on instructionsINA  0.73 
SWAN 9—forgetfulnessINA  0.69 
SWAN 6—engages in tasks requiring mental effortINA  0.69 
SWAN 1—attention to detailINA  0.69 
SWAN 2—sustains attentionINA  0.61 
SWAN 3—listens when spoken toINA  0.460.35
SWAN 8—easily distractedINA  0.38 
  1. Component loadings above 0.3 are shown
  2. 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