Table 3 Results of the polytomous Rasch model for the capacity metric

WG1

B5002

Do you have difficulty seeing, even if wearing glasses?

00122

1,326

1,258

-1,326

− 2,387

− 0,264

WG2

B5003

Do you have difficulty hearing, even if using a hearing aid?

00122

1,143

1,153

0,879

0,556

1,203

WG3

B5004

Do you have difficulty walking or climbing steps?

00122

0,615

0,723

0,060

−0,320

0,441

00122

1,005

1,037

− 0,831

− 1,453

− 0,209

WG4

B5005

Do you have difficulty remembering or concentrating?

00122

0,870

0,927

0,512

−0,794

1,817

00122

1,011

1,020

0,137

−0,761

1,035

WG5

B5006

Do you have difficulty (with self-care such as) washing all over or dressing?

00112

0,370

0,691

1,748

1,220

2,277

00122

0,878

0,871

1,559

1,023

2,096

I5007

B5007

How much difficulty do you have sleeping because of your health?

00122

0,836

0,918

−0,076

−0,662

0,510

00122

1,030

1,079

0,352

−0,239

0,943

I5009

B5008

How much difficulty do you have doing house tasks because of your health?

00122

0,591

0,713

0,553

0,351

0,754

00122

0,551

0,654

0,448

−0,293

1,190

I5011

B5009

Because of your health, how much difficulty do you have with joining community activities, such as festivities, religious or other activities?

01112

0,988

0,950

0,471

0,181

0,761

00122

0,641

0,683

0,371

−0,176

0,919

I5013 & I5014

B5010

How much difficulty do you have with feeling sad, low or depressed because of your health? How much difficulty do you have with feeling worried, nervous or anxious because of your health?

Collapsed Testlet

0,894

0,899

−0,640

−2,001

0,720

Collapsed Testlet

0,974

1,082

0,108

−0,203

− 1,788

2,467

− 0,044

I5015

B5011

Because of your health, how much difficulty do you have getting along with people who are close to you, including your family and friends?

00122

0,943

1,004

1,547

1,110

1,985

00122

0,610

0,717

0,844

−0,128

1,815

I5017

B5012

How much bodily aches or pain do you have?

00122

0,846

0,835

− 1,180

− 2,351

− 0,008

00122

1,028

1,037

− 1,135

− 2,413

0,143