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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.