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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 U

p value

Effect size

Gender

Male; percentage (N)

81 (13)

80 (41)

N/Aa

1.00

 

Ability

Partially able/able; percentage (N)

100 (16)

96 (49)

N/Aa

1.00

 

Mobility

Mobile; percentage (N)

100 (16)

96 (49)

N/Aa

1.00

 

Speech

Verbal; percentage (N)

81 (13)

94 (48)

N/Aa

.142

 

Mood total score

Median (IQR)

38 (9)

36 (11)

357

.448

 

Mood

Median (IQR)

20 (3)

20 (5)

394

.830

 

Interest and pleasure

Median (IQR)

17 (6)

15 (7)

353

.417

 

Activity total score

Median (IQR)

43 (29)

18 (22)

187

< .001*

0.4

Impulsivity

Median (IQR)

19 (11)

10 (9)

187

< .001*

0.4

Overactivity

Median (IQR)

21 (20)

5 (9)

176

< .001*

0.4

Repetitive behaviour total score

Median (IQR)

26 (28)

14 (17)

228

.008*

0.3

Compulsive behaviour

Median (IQR)

9 (13)

5 (7)

275

.051

 

Insistence on sameness

Median (IQR)

5 (4)

3 (5)

224

.006*

0.3

Stereotyped behaviour

Median (IQR)

7 (11)

3 (8)

286

.068

 

Autism phenomenology total score

Median (IQR)

23 (14)

17 (12)

244

.015*

0.3

Communication

Median (IQR)

8 (4)

7 (3)

345

.346

 

Social interaction

Median (IQR)

9 (7)

5 (5)

281

.060

 
  1. aFisher’s exact was calculated where 50% expected count < 5
  2. *p < .05