Table 2 Exploratory factor Loadings for the Malaysian version of St George Respiratory COPD specific questionnaire (SGRQ-CM)

Q1: I cough

0.536

0.663

Q2: Phlegm was expelled when I cough

0.414

0.577

0.712

Q3: I have shortness of breath

0.376

0.473

0.538

Q4: I have attacks of wheezing

0.450

0.604

Q5: How many attacks of chest problem did you have during the last year?

0.640

0.728

Q6: How often do you have good days (with not many chest problems)?

0.517

0.470

0.571

Q7: If you experience wheezing, is it worse in the morning?

Q9.1: Make you feel breathless getting washed or dressed

0.700

0.839

Q9.2: Make you feel breathless walking around the home

0.473

0.555

Q9.3: Make you feel breathless walking outside on flat ground

0.329

0.416

Q9.4: Make you feel breathless walking up a flight of stairs

0.540

0.424

Q9.5: Make you feel breathless walking up hills

0.568

0.383

0.642

Q12.1: I take a long time to take a bath or put on clothes

0.284

0.410

Q12.2: I cannot take a bath or shower, or I take a long time

0.371

0.524

Q12.3: I walk slower than other people, or I stop for rests

0.488

0.443

0.519

Q12.4: Jobs such as housework take a long time, or I have to stop for rests

0.621

0.765

Q12.5: If I walk up one flight of stairs, I have to go slowly or stop

0.517

0.561

Q12.6: If I hurry or walk fast, I have to stop or slow down

0.352

0.434

Q12.7: My breathing makes it difficult to do things such as walk up hills, carrying things upstairs, light gardening such as weeding, dance, play bowling or play golf

__

__

__

__

__

__

Q12.8: My breathing makes it difficult to do things such as carry heavy stuff, dig the garden or gardening, jog or walk at 5 miles per hour, play tennis or swim

0.487

0.559

Q8: How would you describe your chest condition?

0.477

0.398

Q10.1: My cough hurts

0.534

0.568

Q10.2: My cough makes me tired

0.516

0.587

Q10.3: I am breathless when I talk

0.384

0.454

Q10.4: I am breathless when I bend over

0.270

0.416

Q10.5: My cough or breathing disturbs my sleep

0.451

0.632

Q10.6: I get exhausted easily

0.375

0.510

0.563

Q11.1: My cough or breathing is embarrassing in public

0.514

0.538

Q11.2: My chest problem is a nuisance to my family, friends or neighbors

0.302

0.464

Q11.3: I get scared or panic when I cannot breathe

0.289

0.408

Q11.4: I feel that I am not in control of my chest problem

0.533

0.434

Q11.5: I have become weak or an invalid due to my chest problems

0.364

0.565

0.731

Q11.6: Exercise is not safe for me

0.445

0.508

Q11.7: Everything seems too much of an effort

0.615

0.663

Q13.1: I cannot play sports or games

0.380

0.512

Q13.2: I cannot go out for entertainment or recreation

0.343

0.459

Q13.3: I cannot go out of the house to do the shopping

0.486

0.429

Q13.4: I cannot do housework

0.497

0.624

Q13.5: I cannot move far from my bed or chair

0.360

0.439

Q14: How does your chest problem affect you?

−0.659

−0.299

0.568