Skip to main content

Table 2 Differences in responses to extremes of response options between selected legacy (original) and rewritten PF-10a a and HAQ-DI b items

From: Better assessment of physical function: item improvement is neglected but essential

  

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

   
 

Legacy c

Rewritten d

 

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**

  1. aPF-10: 10-item physical function scale of the SF-36.
  2. bHAQ-DI: Health Assessment Questionnaire Disability Index.
  3. Response option sets:
  4. cLegacy PF-10: Yes, limited a lot; yes, limited a little; no, not limited at all
  5. dRewritten PF-10: Not at all, very little, somewhat, quite a lot, cannot do
  6. eLegacy HAQ-DI: Without any difficulty, with some difficulty, with much difficulty, unable to do
  7. fRewritten HAQ-DI: Without any difficulty, with a little difficulty, with some difficulty, with much difficulty, unable to do
  8. * P < 0.01; ** P < 0.05 between Legacy and Rewritten items.