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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).