Table 2

Differences in responses to extremes of response options between selected legacy (original) and rewritten PF-10aa and HAQ-DIb items

PF-10

Legacyc

Rewrittend

Original Stem: During a typical day does your health now limit you in ... If so, how much?

New Stem: How much does your health now limit you ...

Items

Total Completing Item

(n)

Yes, limited

a lot (%)

No, not limited at all

(%)

Total Completing Item

(n)

Cannot do

(%)

Not at

all

(%)


1. Bathing and dressing yourself

81

0

65

74

4

61

2. Climbing one flight of stairs

77

8

55

71

24

41

3. Walking several hundred yards

75

20

55

81

19

48

4. Walking more than a mile

81

32

33

78

31

22

5. Vigorous activities (running, lifting heavy objects, participating in strenuous sports

Mean instrument score: All 10 PF-10 items

19.8

44.9

23.6

35.6*

HAQ-DI

Legacyc

Rewrittend

Original stem: Over the past week, have you been able to ...

New stem: Are you able to ...

Total completing item

(n)

Unable to do (%)

Without any difficulty (%)

Total completing item

(n)

Unable to do

(%)

Without any difficulty (%)

1. Lift full cup or glass to mouth

81

0

91

78

0

88

2. Climb up five steps

81

2

69

75

4

71

3. Get in and out of a car

71

3

61

71

1

54

4. Reach and get down a 5 lb. object from above your head

78

10

62

81

9

48

5. Chores such as vacuuming/yard work

74

18

35

71

21

30

Mean instrument score: All 20 HAQ-DI items

4.8

73.2

4.7

66.3**


aPF-10: 10-item physical function scale of the SF-36.

bHAQ-DI: Health Assessment Questionnaire Disability Index.

Response option sets:

cLegacy PF-10: Yes, limited a lot; yes, limited a little; no, not limited at all

dRewritten PF-10: Not at all, very little, somewhat, quite a lot, cannot do

eLegacy HAQ-DI: Without any difficulty, with some difficulty, with much difficulty, unable to do

fRewritten HAQ-DI: Without any difficulty, with a little difficulty, with some difficulty, with much difficulty, unable to do

* P < 0.01; ** P < 0.05 between Legacy and Rewritten items.

Bruce et al. Arthritis Research & Therapy 2009 11:R191   doi:10.1186/ar2890

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