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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

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