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Table 2 Results of the PIRT analysis using Generalized Partial Credit Model per factor

From: Perceived Vulnerability to Disease Questionnaire: psychometric validation with a Portuguese sample

Item

a

b1

b2

b3

b4

b5

b6

PI

       

 Q8

1.923

− 1.291

0.412

0.555

0.648

1.405

2.168

 Q10

1.113

− 0.902

1.497

0.326

2.984

0.719

2.37

 Q12

1.007

− 3.341

− 0.347

0.101

0.368

1.232

2.045

 Q14

0.7

− 2.772

− 0.5

− 0.219

1.044

2.667

1.377

 Q2

0.562

− 1.256

1.656

0.281

1.997

3.852

1.318

 Q6

0.425

− 0.963

3.325

− 0.416

2

6.297

− 1.44

 Q5

0.31

− 3.701

− 0.189

− 0.637

2.211

0.023

2.199

GA

       

 Q1

1.234

− 1.891

− 1.952

− 1.419

− 1.734

− 0.749

0.476

 Q7

1.093

− 0.284

1.034

0.75

1.149

2.399

3.239

 Q15

0.513

0.298

0.961

− 0.659

2.148

3.051

0.839

 Q4

0.465

− 1.704

0.273

0.247

− 0.689

0.237

1.611

 Q11

0.449

− 1.279

0.417

1.284

− 2

2.384

0.837

 Q3

0.422

− 2.268

− 0.802

0.348

1.044

0.262

0.067

 Q13

0.386

− 3.475

0.881

1.476

0.234

1.961

4.371

 Q9

0.234

− 1.348

0.674

0.614

0.395

0.104

1.327

  1. Items deemed problematic are underlined
  2. Bold to highlight that they are the factors of the items appearing below
  3. a, discrimination ability; PI, perceived infectability; GA, germ aversion
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BMC Psychology

ISSN: 2050-7283

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