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Table 1 Demographic and behavioural characteristics of those who participated at T3 and those who declined to take part T3

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

  Took part T3
N = 67
Declined to take part T3
N = 205
Mann-Whitney U/χ2p value
AgeMedian (IQR)12 (8)10 (7.75)5682.055
Gender% male80.6% (54)87% (176).405.525
Ability% partially able/able94% (63)90% (183)6110.173
Mobility% mobile97% (65)97% (197)N/Aa1.000
Speech% verbal91% (61)86% (174)1.097.295
Self-injury% with behaviour37.3% (25)37% (76).004.949
Mood total scoreMedian (IQR)35 (9)33 (10)6472.593
Activity total scoreMedian (IQR)32 (31)39 (32)5475.037*
TAQ impulsivityMedian (IQR)15 (12)17 (10)5613.046*
TAQ overactivityMedian (IQR)14 (14)16 (18)5758.076
Repetitive behaviour total scoreMedian (IQR)35 (9)28 (25)4734< .001*
RBQ compulsive behaviourMedian (IQR)5 (7)6 (11)5462.046*
RBQ insistence on samenessMedian (IQR)3 (6)4 (5)5667.181
RBQ restricted preferencesMedian (IQR)3 (5)5 (5)3988.004*
RBQ repetitive use of languageMedian (IQR)6 (6)6 (7)4669.200
Autism phenomenology total scoreMedian (IQR)25 (10)25 (11)5462.628
  1. aFisher’s exact was calculated where 50% expected count < 5, *p < .05