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Table 4 Individual item fit of final Optimism and Protective Self-Worth item sets across two validation samples

From: Assessing vulnerability to risk of suicide and self-harm in prisoners: a Rasch analysis of the suicide concerns for offenders in the prison environment (SCOPE-2)

 

Location

(logits)

Fit Residual

(z-value)

Chi-square

P-value

ANOVA

P-value

 

Item

Statement

Sample 0

Sample 1

Sample 0

Sample 1

Sample 0

Sample 1

Sample 0

Sample 1

Optimism

1

I do not feel lonely in my room on my own

0.135

0.308

1.773

1.831

0.086

0.143

0.094

0.163

5

If I were on remand I would not feel stressed out

−0.444

− 0.54

− 0.087

− 0.869

0.417

0.274

0.326

0.137

8

I feel fine about coming into this establishment

−0.279

− 0.147

0.208

− 1.224

0.232

0.450

0.177

0.234

11

If I am nervous I do not lose my appetite

−0.003

0.041

0.288

0.788

0.503

0.916

0.374

0.900

14

I think that everyone likes me

−0.045

0.026

1.177

0.915

0.936

0.813

0.930

0.788

18

If I worry about things I sleep OK

−0.012

0.01

−0.459

0.526

0.319

0.437

0.203

0.409

19

If I were depressed I would talk to someone

−0.477

−0.589

0.618

1.814

0.419

0.229

0.379

0.279

21

I do not think about how I can end my life

1.079

1.029

0.723

0.457

<.005a

0.718

<.005a

0.688

23

I can think straight when I am depressed

−0.607

−0.714

1.262

0.01

0.800

0.166

0.815

0.114

24

I feel like there is hope in my life

0.653

0.576

1.617

1.148

0.605

0.992

0.736

0.999

Protective Self-Worth

2

If I had a job I would not commit crime

0.021

−0.036

0.678

2.677a

0.776

0.145

0.788

0.211

3

If I were feeling suicidal I would speak to someone

−0.06

−0.089

1.143

1.83

0.275

0.966

0.278

0.973

10

When arrested I would say I was sorry

−0.446

−0.515

−0.582

−1.907

0.148

<.005a

0.093

<.005a

12

If I stole money for drugs I would feel like I had let myself down

0.147

0.037

−1.652

0.14

0.034

0.544

0.009

0.611

15

The day before I was due to appear in court I would think about the future

0.109

−0.004

0.102

0.836

0.527

0.706

0.507

0.801

20

My family support me

0.522

0.706

1.566

1.57

0.325

0.148

0.335

0.121

22

If I had a fight with a prisoner I would ask to see the governor

−0.901

−0.885

1.238

1.316

0.892

0.313

0.903

0.291

26

If I had a supportive family I would not kill myself

0.64

0.801

1.975

1.291

0.256

0.590

0.256

0.592

27

I always turn up in court

−0.033

−0.014

0.429

−1.608

0.514

0.028

0.615

0.012

  1. a item misfit indicated – in all cases this is inconsistent between samples