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Table 2 Principle components analysis (oblique rotation) of 47 items of impulsivity: Parent and teacher ratings from Conners and SDQ questionnaires (CP, SP and CT, ST, respectively).

From: The influence of serotonin- and other genes on impulsive behavioral aggression and cognitive impulsivity in children with attention-deficit/hyperactivity disorder (ADHD): Findings from a family-based association test (FBAT) analysis

Part 1 – The aggressive behavioral form of impulsivity (factors 1 and 2)
Item Descriptor Factor 1 Factor 2
CP47 Temper outbursts 0.950  
CP21 Loses temper 0.893  
SP5 Often has temper tantrums 0.896  
CP31 Irritable 0.840  
CP57 Touchy or easily annoyed 0.859  
CP77 Mood changes quickly 0.820  
CP1 Angry and resentful 0.916  
CP40 Actively defies or refuses to 0.780  
CP11 Argues with adults 0.826  
CP68 Demands to be met at once 0.598  
CP28 Excitable, impulsive 0.356  
CP70 Spiteful or vindictive 1.000  
SP12 Often fights with other children 0.588  
CP66 Disturbs other children 0.294  
CP64 Get upset if someone rearranges 0.947  
SP7 Generally obedient, usually ... -0.510  
ST5 Often has temper tantrums   1.000
CT7 Temper outbursts; explosive,   0.972
CT45 Demands must be met at once   0.898
CT54 Mood changes quickly, drastically   0.945
CT37 Argues with adults   0.957
CT55 Interrupts or intrudes on others   0.655
CT8 Excitable, impulsive   0.661
CT29 Has difficulty waiting in turn   0.606
CT46 Blurts out answers to question   0.674
ST12 Often fights with other children   0.922
CT47 Spiteful or vindictive   0.989
CT20 Leaves seat in classroom or   0.544
ST7 Generally obedient, usually   -0.700
ST25 Good attention span sees   -0.958
Variance Explained 14.6 13.2
Eigen Value 20.4 4.42
Squared Multiple Correlation 0.92 0.90