Table 1 Demographic data of Op Walk Boston patients from 2009–2012 who returned for follow-up and completed the YPAS in 2013

Preoperative demographic characteristics

Mean (SD)

Range

Age (n: 64)

61.1 (13.9)

21-80

Number

Percent

Gender (n: 64)

Female

51

79.7

Male

13

20.3

Socioeconomic characteristics

Marital status (n: 62)

Single

19

30.7

Married

22

35.5

Divorced, separated, or widowed

21

33.9

Living situation (n: 62)

Alone

6

9.7

With family or friends

56

90.3

Work status (n: 63)

Working

10

15.9

Not working

53

84.1

Education (n: 62)

Less than secondary school

25

40.3

Secondary school, but did not graduate

25

40.3

Graduated from secondary school or beyond

12

19.4

Surgery information

Procedure (n: 64)

Unilateral

38

59.4

Bilateral

26

40.6

Joint (n: 66)*

Knee

52

81.3

Hip

14

21.9

Year (n: 64)

2009

8

12.5

2010

13

20.3

2011

22

34.4

2012

21

32.8

BMI (n: 55)

<30

42

76.4

30-35

9

16.4

≥35

4

7.3

Self-rated health (n: 61)

Excellent or very good

17

27.9

Good

20

32.8

Fair or Poor

24

39.3

Perception of probability of surgical complication (n: 61)

<1% chance of major complication

43

70.5

1-5% chance of major complication

8

13.1

5-10% chance of major complication

9

14.8

10-20% chance of major complication

1

1.6

More than 20% chance of major complication

0

0

Perception of probablity that surgery will relieve pain (n: 63)

>90% chance of pain relief

48

76.2

70-90% chance of pain relief

11

17.5

50-70% chance of pain relief

4

6.4

25-50% chance of pain relief

0

0

<25% chance of pain relief

0

0

Preoperative scores (n: 64)

Mean (SD)

Range

WOMAC pain**

59.9 (23.1)

10-100

WOMAC function**

62.0 (22.0)

8.8-100

SF-36 mental health***

78.0 (19.3)

12-100

SF-36 physical function***

18.6 (19.4)

0 - 85

Postoperative scores (n: 64)

WOMAC pain**

20.2 (23.6)

0-90

WOMAC function**

16.6 (16.3)

0-62

SF-36 physical function***

68.4 (24.7)

10-100