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Table 3 Proportions of TJR by BMI, SES, median age categories, and current smoking status

From: Smoking and primary total hip or knee replacement due to osteoarthritis in 54,288 elderly men and women

BMI

SES categories

Number of participants

Age

Age

All ages

57–72 yrs

73 + yrs

BMI < 30

Low SES

    

Current smoker

1,208

5.5

4.8

5.2

Non smoker

10,567

8.2!

5.4

6.8!

Middle SES

    

Current smoker

999

4.9

4.1

4.6

Non smoker

11,074

8.8!

6.5

7.6!

High SES

    

Current smoker

829

5.8

3.2

4.8

Non smoker

11,628

9.1!

5.6

7.3!

All SES categories

    

Current smoker

3,036

5.4

4.1

4.9

Non smoker

33,269

8.7!!

5.8!

7.2!!

BMI > =30

Low SES

    

Current smoker

216

5.6

5.6

5.6

Non smoker

2,907

14.6!

10.1

12.8!!

Middle SES

    

Current smoker

160

8.8

3.5

6.9

Non smoker

2,634

17.1!

9.7

14.0!

High SES

    

Current smoker

123

9.2

8.0

8.9

Non smoker

2,269

14.3

9.5

12.3

All SES categories

    

Current smoker

499

7.5

5.1

6.8

Non smoker

7,810

15.4!!

9.8

13.0!!

ALL

Current smoker

3,535

5.7

4.2

5.2

Non smoker

41,079

10.2!!

6.5!

8.3!!

  1. Abbreviations: BMI (body mass index), SES (socioeconomic status based on the distribution of Socio-Economic Indices for Areas (SEIFA) in the cohort; Low SES 1st tertile, Middle SES 2nd tertile, High SES 3rd tertile), TJR (total joint replacement).
  2. ! 0.001 < P value < 0.05; !! P value < 0.001, the non-smokers were compared with the smokers in all categories.