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Table 6 Descriptive statistics for the location and slope parameters for the final items

From: Assessment of health-related quality of life in arthritis: conceptualization and development of five item banks using item response theory

Statistic

Daily Activities

Walking

Handling Objects

Pain or Discomfort

Feelings

 

Location

Slope

Location

Slope

Location

Slope

Location

Slope

Location

Slope

Mean

-0.664

1.610

-0.097

1.729

-0.774

1.354

-0.497

1.294

-0.573

1.154

SD

0.805

0.463

0.859

0.550

0.897

0.409

0.834

0.544

0.819

0.390

Min.

-2.237

0.970

-1.274

0.611

-1.698

0.662

-1.896

0.649

-2.349

0.560

25%

-1.434

1.264

-0.708

1.346

-1.341

1.036

-1.169

0.859

-1.186

0.863

Median

-0.511

1.466

-0.380

1.747

-1.180

1.278

-0.352

1.102

-0.639

1.071

75%

0.014

1.947

0.456

2.145

-0.451

1.707

0.071

1.627

0.211

1.434

Max.

0.546

3.156

1.958

2.695

2.272

2.104

1.637

2.546

1.011

1.989