Skip to main content

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

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  
  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