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Table 3 PROMIS Global Health items descriptives, scalability, graded response model fit, range of item discrimination and difficulties, internal consistency, measurement invariance and cross-cultural validity in the total sample of the Dutch general population (N = 4370)

From: Psychometric properties of the patient-reported outcomes measurement information system scale v1.2: global health (PROMIS-GH) in a Dutch general population

Items description

Descriptives

Mokken scalability

GRM model fit

Range of item discrimination and difficulties*

Internal consistency

Measurement invariance

Cross cultural validity

Mean (SD)

Range (Min–Max)

Skewness (SE)

Kurtosis (SE)

Hi (SE)

S-X2

p

α

β1

β2

β3

β4

IIT

αIID

Sex

Age

Region

Educ. level

Ethnicity

Global Mental Health

Global02: quality of life

3.0

(0.9)

1–5

0.08

(0.04)

− 0.17 (0.07)

0.633

(0.009)

94.550

 < 0.001

3.507

− 1.935

− 0.603

0.710

1.893

0.72

0.76

0.0025

0.0065

0.0005

0.0014

0.0001

0.0041

Global04: mental health, including mood and ability to think

3.1

(1.0)

1–5

0.01 (0.04)

− 0.32 (0.07)

0.654

(0.009)

160.820

 < 0.001

2.757

− 2.047

− 0.783

0.529

1.648

0.73

0.75

0.0007

0.0031

0.0001

0.0006

0.0011

0.0028

Global05: satisfaction with social activities and relationships

3.0

(0.9)

1–5

0.03 (0.04)

− 0.15 (0.07)

0.603

(0.010)

87.731

 < 0.001

2.849

− 1.855

− 0.644

0.739

1.916

0.68

0.78

0.0017

0.0031

0.0003

0.0012

0.0018

0.0032

Global10: bothered by emotional problems

3.7

(1.0)

1–5

− 0.31 (0.04)

− 0.64 (0.07)

0.518

(0.012)

323.387

 < 0.001

1.321

− 3.717

− 1.779

− 0.220

1.181

0.52

0.85

0.0070

0.0165

0.0017

0.0034

0.0020

0.0136

Global physical health

Global03: physical health

2.7

(0.9)

1–5

0.24

(0.04)

− 0.23 (0.07)

0.565

(0.010)

145.562

 < 0.001

2.266

− 1.792

− 0.239

1.094

2.248

0.62

0.71

0.0010

0.0022

0.0019

0.0021

0.0041

0.0046

Global06: carry out every day physical activities

4.1

(1.2)

1–5

− 0.91 (0.04)

− 0.32 (0.07)

0.525

(0.013)

184.359

 < 0.001

1.943

− 2.668

− 1.619

− 0.705

− 0.055

0.55

0.74

0.0018

0.0013

0.0005

0.0030

0.0003

0.0006

Global07: pain on average

3.1

(2.7)

1–5

0.41 (0.04)

− 1.16 (0.07)

0.547

(0.010)

82.367

 < 0.001

2.063

− 3.641

− 1.306

− 0.279

0.916

0.62

0.71

0.0013

0.0047

0.0002

0.0013

0.0011

0.0048

Global08: fatigue on average

3.4

(1.0)

1–5

− 0.16 (0.04)

− 0.50 (0.07)

0.513

(0.011)

64.189

 < 0.001

1.705

− 2.844

− 1.291

0.144

1.548

0.56

0.74

0.0029

0.0458

0.0018

0.0049

0.0034

0.0002

Items not contributing to the subscale scores

Global01: general health

2.8

(0.9)

1–5

0.20

(0.04)

− 0.16 (0.07)

–

–

–

–

–

–

–

–

–

–

–

–

–

–

–

–

Global09: usual social activities and roles

3.0

(0.9)

1–5

0.07

(0.04)

− 0.12 (0.07)

–

–

–

–

–

–

–

–

–

–

–

–

–

–

–

–

Recommended values

N/A

N/A

N/A

N/A

 > 0.30

N/A

 ≥ 0.001

 > 1.0

N/A

N/A

N/A

N/A

 ≥ 0.40

 < α

 < 0.02

 < 0.02

 < 0.02

 < 0.02

 < 0.02

 < 0.02

  1. α, Cronbach’s alpha; αIID, α if item deleted GRM, Graded Response Model; Hi, scalability coefficient for item; IIC, itam-to-total correlation; N/A, not applicable; p, p-value; S-X2, item fit statistics under the Graded Response Model; SD, standard deviation; SE, standard error
  2. Statistics values beyond the recommended cut-offs presented in bold
  3. For interpretation of the indexes, refer to Table 1
  4. Global08 and Global10 have been recoded according the instruction in the PROMIS-GH Scoring Manual
  5. Possible response range for each item varies from 1 to 5 points
  6. Cross-cultural validity was studied using data from the US PROMIS Wave 1 sample, obtained from the Health Measures Dataverse [12, 18]
  7. * Item parameters were estimated using the Dutch dataset in this paper; the official PROMIS item parameters used in CAT are available from help@healthmeasures.net
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Health and Quality of Life Outcomes

ISSN: 1477-7525

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