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Table 6 T3 demographic and behavioural characteristics for participants with and without self-injury at T3

From: Persistence and predictors of self-injurious behaviour in autism: a ten-year prospective cohort study

  Individuals with self-injury T3 (N = 16)Individuals without self-injury T3 (N = 51)Chi-square/Mann-Whitney Up valueEffect size
GenderMale; percentage (N)81 (13)80 (41)N/Aa1.00 
AbilityPartially able/able; percentage (N)100 (16)96 (49)N/Aa1.00 
MobilityMobile; percentage (N)100 (16)96 (49)N/Aa1.00 
SpeechVerbal; percentage (N)81 (13)94 (48)N/Aa.142 
Mood total scoreMedian (IQR)38 (9)36 (11)357.448 
MoodMedian (IQR)20 (3)20 (5)394.830 
Interest and pleasureMedian (IQR)17 (6)15 (7)353.417 
Activity total scoreMedian (IQR)43 (29)18 (22)187< .001*0.4
ImpulsivityMedian (IQR)19 (11)10 (9)187< .001*0.4
OveractivityMedian (IQR)21 (20)5 (9)176< .001*0.4
Repetitive behaviour total scoreMedian (IQR)26 (28)14 (17)228.008*0.3
Compulsive behaviourMedian (IQR)9 (13)5 (7)275.051 
Insistence on samenessMedian (IQR)5 (4)3 (5)224.006*0.3
Stereotyped behaviourMedian (IQR)7 (11)3 (8)286.068 
Autism phenomenology total scoreMedian (IQR)23 (14)17 (12)244.015*0.3
CommunicationMedian (IQR)8 (4)7 (3)345.346 
Social interactionMedian (IQR)9 (7)5 (5)281.060 
  1. aFisher’s exact was calculated where 50% expected count < 5
  2. *p < .05