Table 1 Hierarchical logistic regression analyses with the occurrence of self-harm as a dependent variable

Demographic data

 Age

− 0.249

2.501

0.780

− 0.363

1.073

0.696

 Sex

0.600

1.156

1.823

0.960

0.513

2.612

 SES

− 0.009

0.012

0.991

− 0.049

0.050

0.953

 Family history of self-harm

1.351

3.245

3.860

1.493

0.776

4.450

Internalizing symptoms

 Depressive symptoms

− 0.010

0.564

0.990

− 0.003

0.008

0.997

 Anxiety symptoms

− 0.014

0.995

0.987

0.037

1.082

1.038

Autistic traits

 Total

0.071

1.866

1.073

− 0.005

0.002

0.995

 Social skills

0.254

8.922

1.289**

0.221

1.260

1.247

 Communication

0.265

4.491

1.304*

− 0.084

0.102

0.919

IPTS variable

 Thwarted belonging

0.242

7.025

1.273**

 Perceived burdensomeness

0.227

11.394

1.254**

Statistics of the model

 − 2LL

 Model χ²

 Step χ²

 Nagelkerke R²

 Classification accuracy

135.380

30.976 (df = 9)***

30.976 (df = 9)***

0.303

72.5

53.966

112.389 (df = 11)***

81.413 (df = 2)***

0.811

89.2