Table 2 Class conditional item response probabilities of the two classes (i.e. male and female dominated)

Relationship status at index offence

 Single

0.2475

0.5222

0.7697

 Married

0.0986

0.1887

0.0901

 Married, living separated

0.0315

0.0703

0.0388

 Divorced

0.0875

0.1795

0.092

 Widowed

0.0281

0.0328

0.0047

 In a committed relationship

0.0019

0.0066

0.0047

Homelessness at time of index offence

 No

0.1447

0.8837

0.739

 Yes

0.1447

0.1163

0.261

Highest level of education completed successfully

 No graduation

0

0

0

 Primary school

0.004

0.2579

0.2619

 Secondary school (high school)

0.2991

0.1769

0.476

 Baccalaureate

0.0763

0.127

0.0507

 Vocational school

0

0

0

 College

0.1408

0.3464

0.2056

 University

0

0

0

 Unknown

0.086

0.0918

0.0058

Number of criminal registry entries

 0

0

0

0

 1

0.2892

0.4612

0.172

 2–3

0.014

0.2691

0.2831

 4–8

0.0844

0.1671

0.2515

  > 8

0.1908

0.1026

0.2934

Number of previous criminal convictions

 0

0.2005

0.6952

0.4947

 1–2

0.0559

0.1208

0.1767

  > 2

0.1446

0.184

0.3286

Age at first criminal registry entry

  < 21

0.3154

0.1122

0.4276

 21–35

0.0784

0.3947

0.4731

  > 35

0.3939

0.4931

0.0992

Previous offences: homicide/attempted homicide

 No

0.0342

0.9512

0.9854

 Yes

0.0342

0.0488

0.0146

Previous offences: assault

 No

0.0984

0.6811

0.5827

 Yes

0.0984

0.3189

0.4173

Previous offences: threat, coercion

 No

0.0894

0.7738

0.6844

 Yes

0.0894

0.2262

0.3156

Previous offences: sexual abuse of children

 No

0.0249

0.9677

0.9926

 Yes

0.0249

0.0323

0.0074

Previous offences: rape, sexual assault

 No

0.0279

0.9556

0.9835

 Yes

0.0279

0.0444

0.0165

Previous offences: other sexual offence

 No

0.02

0.951

0.971

 Yes

0.02

0.049

0.029

Previous offences: property crime without violence

 No

0.2271

0.755

0.5279

 Yes

0.2271

0.245

0.4721

Previous offences: property crime with violence

 No

0.1909

0.9802

0.7893

 Yes

0.1909

0.0198

0.2107

Previous offences: arson

 No

0.0115

0.9315

0.943

 Yes

0.0115

0.0685

0.057

Previous offences: criminal damage

 No

0.1672

0.8292

0.662

 Yes

0.1672

0.1708

0.338

Previous offences: traffic offence

 No

0.1874

0.9085

0.7211

 Yes

0.1874

0.0915

0.2789

Previous offences: controlled substances act

 No

0.4873

0.9048

0.4175

 Yes

0.4873

0.0952

0.5825

Previous offences: weapons act

 No

0.0931

0.9733

0.8802

 Yes

0.0931

0.0267

0.1198

Index offence: homicide/attempted homicide

 No

0.1748

0.6085

0.7833

 Yes

0.1748

0.3915

0.2167

Index offence: assault

 No

0.0999

0.6527

0.5528

 Yes

0.0999

0.3473

0.4472

Index offence: threat, coercion

 No

0.0516

0.7363

0.6847

 Yes

0.0516

0.2637

0.3153

Index offence: sexual abuse of children

 No

0.0093

0.9809

0.9716

 Yes

0.0093

0.0191

0.0284

Index offence: rape, sexual assault

 No

0.0755

0.962

0.8865

 Yes

0.0755

0.038

0.1135

Index offence: other sexual offence

 No

0.0585

0.9658

0.9073

 Yes

0.0585

0.0342

0.0927

Index offence: property crime without violence

 No

0.1512

0.9078

0.7566

 Yes

0.1512

0.0922

0.2434

Index offence: property crime with violence

 No

0.0669

0.9788

0.9119

 Yes

0.0669

0.0212

0.0881

Index offence: arson

 No

0.0386

0.9217

0.8831

 Yes

0.0386

0.0783

0.1169

Index offence: criminal damage

 No

0.0523

0.8861

0.8338

 Yes

0.0523

0.1139

0.1662

Index offence: traffic offence

 No

0.0298

0.9601

0.9303

 Yes

0.0298

0.0399

0.0697

Index offence: controlled substances act

 No

0.2138

0.9641

0.7503

 Yes

0.2138

0.0359

0.2497

Index offence: weapons act

 No

0.0192

0.9567

0.9375

 Yes

0.0192

0.0433

0.0625

Index offence: misuse of emergency system

 No

0.0172

0.9936

0.9764

 Yes

0.0172

0.0064

0.0236

Victim(s) of index offence had close relationship to patient

 No

0.1096

0.7964

0.906

 Yes

0.1096

0.2036

0.094

Victims of index offence were the patient’s parents

 No

0.0362

0.9522

0.916

 Yes

0.0362

0.0478

0.084

Victims of index offence were the patient’s siblings

 No

0.0337

0.9899

0.9562

 Yes

0.0337

0.0101

0.0438

Victims of index offence were the patient’s offspring

 No

0.0482

0.9461

0.9943

 Yes

0.0482

0.0539

0.0057

Victims of index offence were other relatives of the patient

 No

0.0114

1

0.9886

 Yes

0.0114

0

0.0114

Victim of index offence had any form of relationship to patient

 Yes, some form of relationship

0.11

0.72

0.61

 None

0.11

0.28

0.39

Victim of abuse by a related person

 No

0.1112

0.8435

0.9547

 Yes

0.1112

0.1565

0.0453

Victim of any crime

 No

0.0247

0.852

0.8767

 Yes

0.0247

0.148

0.1233

Criminal responsibility as per judgement

 Yes, fully

0.049

0.3215

0.3705

 Yes, partially

0.0353

0.1144

0.1497

 None

0.0298

0.4865

0.4567

 No judgement

0.046

0.0691

0.0231

 Unknown

0.0086

0.0086

0

Prison term in months for index offence

  ≤ 13

0.0282

0.3511

0.3229

 14–48

0.2589

0.2054

0.4643

  > 48

0.2307

0.4435

0.2128

Age at first diagnosis of schizophrenia

  < 21

0.2422

0.1198

0.362

 21–35

0.001

0.5307

0.5317

  > 35

0.2432

0.3495

0.1063

Age at first psychiatric inpatient treatment

  < 21

0.2951

0.1452

0.4403

 21–35

0.0432

0.5137

0.4705

  > 35

0.252

0.3411

0.0891

Number of psychiatric inpatient treatments

  ≤ 1

0.1691

0.5207

0.3516

 2–4

0.0029

0.2615

0.2586

  > 4

0.1721

0.2178

0.3899

Alcohol use at any time

 No use

0.3996

0.6246

0.225

 Abuse

0.2692

0.2414

0.5106

 Misuse

0.1304

0.134

0.2644

Any illegal substance use at any time

 Yes

0.624

0.3666

0.9906

 No

0.624

0.6334

0.0094

Cannabis use at any time

 No

0.7485

0.8296

0.0811

 Yes

0.7485

0.1704

0.9189

Opioid use at any time

 No

0.4677

0.9917

0.524

 Yes

0.4677

0.0083

0.476

Cocaine use at any time

 No

0.5522

0.9865

0.4343

 Yes

0.5522

0.0135

0.5657

Amphetamine, ecstasy or other illegal stimulant use at any time

 No

0.3837

1

0.6163

 Yes

0.3837

0

0.3837

Self-injurious behaviour at any time

 No

0.0796

0.5809

0.5013

  Yes

0.0796

0.4191

0.4987

Attempted suicide at any time

 No

0.0356

0.6877

0.6521

 Yes

0.0356

0.3123

0.3479

Suicidal ideation during forensic inpatient treatment

 No

0

0.7966

0.7966

 Yes

0

0.2034

0.2034

Personality disorder diagnosed prior to admission

 Yes

0.0635

0.0909

0.1544

 No

0.0635

0.9091

0.8456

Psychiatric or somatic comorbidity

 No

0.0607

0.6927

0.632

 Yes

0.0607

0.3073

0.368

Total time spent in prison

 0

0.0917

0.2273

0.1356

  ≤ 4 weeks

0.06

0.179

0.119

  ≤ 12 months

0.0726

0.3138

0.3864

 1–2 years

0.0617

0.07

0.1317

  > 2 years

0.0174

0.2099

0.2273

Total time spent in forensic inpatient treatment

 1–11 weeks

0.1757

0.4376

0.2619

 12–150 weeks

0.1232

0.2606

0.3838

  > 150 weeks

0.0525

0.3018

0.3543

Olanzapine equivalent dose at discharge from forensic inpatient treatment

  ≤ 25,7 mg

0.0313

0.7519

0.7206

  > 25,7 mg

0.0313

0.2481

0.2794

Change in positive symptoms over forensic inpatient treatment

 Worsening

0

0

0

 Unchanged

0.1131

0.5212

0.4081

 Slightly better

0.0944

0.4448

0.5392

 Substantially better

0.0187

0.034

0.0527

Change in negative symptoms over forensic inpatient treatment

 Worsening

0.0172

0.0068

0.024

 Unchanged

0.1282

0.6817

0.5535

 Slightly better

0.1097

0.2842

0.3939

 Substantially better

0.0014

0.0273

0.0287

Change in overall psychopathology over forensic inpatient treatment

 Worsening

0.0048

0

0.0048

 Unchanged

0.128

0.6366

0.5086

 Slightly better

0.1252

0.3566

0.4818

 Substantially better

0.002

0.0068

0.0048