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Table 1 Characteristics of study participants by smoking status defined at baseline screening

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

Characteristic

Current smoking status

P value

Yes smoking

Not smoking

N = 3,535 (7.9%)

N = 41,079 (92.1%)

 

Age, mean (SD)

71.4 (4.5)

73.0 (5.0)

<0.001

Male gender, %

52.6

43.8

<0.001

BMI, %

 

Kg/m2

   

Underweight

<18.5

3.3

1.1

 

Normal weight

18.5 – 24.9

44.5

35.2

 

Overweight

25 – 29.9

38.1

44.7

 

Obese

30 – 34.9

11.9

15.4

 

Morbidly obese

35 or more

2.3

3.6

<0.001

SES, %

1st quintile – Lowest SES

27.3

19.7

 

2nd quintile

19.7

19.8

 

3rd quintile

19.6

20.1

 

4th quintile

17.9

20.2

 

5th quintile – Highest SES

15.6

20.2

<0.001

Charlson co-morbidity index, mean (SD)

0.4 (0.8)

0.3 (0.7)

<0.001

Physical exercise > 30 minutes per week, %

49.7

55.8

<0.001

Daily alcoholic drink, %

15.4

7.1

<0.001

Screening systolic blood pressure, mean (SD)

143.0 (19.4)

143.5 (18.7)

0.135

Screening diastolic blood pressure, mean (SD)

79.5 (10.3)

79.2 (9.9)

0.140

  1. Abbreviations: BMI (body mass index), SES (socioeconomic status based on the distribution of Socio-Economic Indexes for Areas (SEIFA) in the cohort).