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Table 3 Rasch item and fit statistics for the NHPDa

From: Cross-diagnostic validity of the Nottingham health profile index of distress (NHPD)

  

Item statistics c

Fit statistics

Item b

 

Location

SE

Residual d

Chi square e

P-value

1 (1)

Tired all the time

-1.154

0.116

1.383

9.057

0.10681

2 (2)

Pain at night

-0.97

0.113

1.914

8.695

0.121867

3 (3)

Things get me down

-0.732

0.116

-1.841

5.612

0.345829

4 (4)

Unbearable pain

0.425

0.14

-1.025

2.982

0.702838

5 (6)

Joy forgotten

0.231

0.134

-2.03

9.32

0.09695

6 (7)

Feeling on edge

-1.127

0.112

0.257

4.383

0.495644

7 (8)

Painful to change position

-1.874

0.113

1.964

2.8

0.73085

8 (9)

Feel lonely

0.297

0.136

0.521

2.791

0.732098

9 (12)

Everything is an effort

-0.95

0.113

-3.107

13.87

0.016456

10 (16)

Days seem to drag

0.617

0.146

-1.448

3.529

0.619006

11 (20)

Losing temper easily

-0.409

0.12

1.321

7.45

0.189241

12 (21)

Feel close to nobody

1.302

0.177

-0.336

6.317

0.276545

13 (22)

Lie awake most of night

1.269

0.174

-1.313

1.735

0.884403

14 (23)

Feel as if losing control

1.05

0.164

-1.557

9.758

0.082392

15 (26)

Soon run out of energy

-1.724

0.111

-1.318

5.277

0.383036

16 (28)

In constant pain

-0.356

0.12

-1.228

5.276

0.38318

17 (29)

Takes long to get to sleep

-0.485

0.118

0.928

4.264

0.512122

18 (30)

Feel like a burden

0.075

0.13

-1.224

3.12

0.681545

19 (31)

Kept awake by worries

0.904

0.157

-1.776

5.506

0.357274

20 (32)

Life not worth living

0.815

0.153

-1.759

5.433

0.365301

21 (33)

Sleep badly at night

-0.966

0.113

0.799

1.207

0.944184

22 (34)

Hard to get on with people

3.458

0.401

-0.896

1.985

0.85118

23 (37)

Depressed when waking up

0.263

0.134

-2.121

6.171

0.28995

24 (38)

In pain when sitting

0.042

0.129

0.193

7.798

0.167709

  1. a Performed with the sample divided into six class intervals according to person locations on the measured variables.
  2. b Original NHP item numbers in parenthesis.
  3. c Expressed in linear log-odds units (logits), with mean item location set at 0.
  4. d Residuals summarize the deviation of observed from expected responses. Deviation from the recommended [35] range of -2.5 to +2.5, indicating item misfit, are bold.
  5. e Higher values represent larger deviations from model expectations.
  6. NHPD, Nottingham Health Profile index of Distress; SE, standard error.
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Health and Quality of Life Outcomes

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