| |
1993-1995
|
1996-1998
|
1999-2001
|
2002-2005
|
P-value
|
|---|
|
Age category
| | | | |
0.002
|
|
<50
|
13.7
|
17.1
|
16.2
|
16.0
| |
|
50- < 65
|
24.7
|
25.9
|
26.6
|
27.5
| |
|
65- <80
|
51.8
|
48.8
|
47.2
|
44.9
| |
|
≥80
|
9.8
|
8.2
|
10.0
|
11.6
| |
|
Mean age (SD)
|
65.0 (13.2)
|
63.5 (14.0)
|
63.9 (14.0)
|
64.3 (13.9)
|
0.03
|
|
Female gender
|
51.8
|
50.0
|
52.0
|
51.9
|
0.67
|
|
BMI
| | | | |
<0.001
|
|
<25
|
28.1
|
26.0
|
24.0
|
21.5
| |
|
25– 29.9
|
38.8
|
40.0
|
37.9
|
37.2
| |
|
30– 34.9
|
23.5
|
24.1
|
23.6
|
25.8
| |
|
35– 39.9
|
7.3
|
6.6
|
9.1
|
9.3
| |
|
≥40
|
2.3
|
3.3
|
5.3
|
6.3
| |
|
Mean BMI (SD)
|
28.0 (5.2)
|
28.3 (5.2)
|
29.1 (6.0)
|
29.6 (6.2)
|
<0.001
|
|
Operative Diagnosis
| | | | |
<0.001
|
|
Osteoarthritis
|
81.8
|
81.0
|
88.2
|
92.2
| |
|
RA/inflammatory arthritis
|
3.7
|
3.7
|
2.4
|
1.3
| |
|
Other
|
14.5
|
15.3
|
9.4
|
6.5
| |
|
Deyo-Charlson Index
| | | | |
<0.001
|
|
0
|
61.9
|
63.2
|
59.2
|
56.7
| |
|
1
|
17.3
|
17.2
|
15.4
|
16.2
| |
|
2
|
8.7
|
9.3
|
11.0
|
11.9
| |
|
3 or more
|
12.2
|
10.2
|
14.4
|
15.1
| |
|
Depression
|
4.5
|
4.8
|
7.2
|
9.8
|
<0.001
|
|
Anxiety
|
3.4
|
3.5
|
4.9
|
5.7
|
0.003
|
- SD, standard deviation; RA, rheumatoid arthritis, BMI, body mass index.
- Significant p-values are in bold. We used analysis of variance for continuous variables and, chi-squared test for categorical variables.
