Table 4 Time-trends in patient characteristics (in %) by patient age category from 1993 to 2005 in patients undergoing primary THA

BMI ≥40

 Age, <50

1.1

7.3

7.2

5.8

0.30

 Age, 50- < 65

3.5

5.3

7.1

9.3

0.007

 Age, 65- <80

2.4

1.3

4.6

5.7

<0.001

 Age ≥80

0

0

1.3

2.2

0.17

Diagnosis of RA/inflammatory arthritis

 Age, <50

17.9

10.5

6.2

4.2

<0.001

 Age, 50- < 65

2.6

3.3

1.9

1.0

0.11

 Age, 65- <80

3.5

4.2

2.3

1.2

0.002

 Age ≥80

0

0

1.4

0

0.11

Deyo-Charlson Index ≥3

 Age, <50

5.7

1.7

4.8

4.8

0.16

 Age, 50- < 65

4.1

6.7

7.8

8.2

0.13

 Age, 65- <80

16.1

12.7

19.8

19.9

<0.001

 Age ≥80

20.8

24.1

21.9

27.2

0.51

Depression

 Age, <50

2.9

3.0

6.0

8.3

0.02

 Age, 50- < 65

5.4

4.8

8.7

9.4

0.02

 Age, 65- <80

4.7

5.2

6.8

9.1

0.002

 Age ≥80

4.0

6.3

7.1

15.8

0.001

Anxiety

 Age, <50

1.7

0.9

2.4

2.9

0.41

 Age, 50- < 65

2.2

2.2

4.9

3.9

0.12

 Age, 65- <80

4.1

5.1

4.8

6.6

0.14

 Age ≥80

3.4

3.5

4.9

5.7

0.06