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Table 1 Patient characteristics

From: The association between smoking and knee osteoarthritis in a cohort of Danish patients undergoing knee arthroscopy

Variables Current smokers (n = 138) Non-smokers (n = 482) P-valuea
Age, years (SD) 45.0 (12.2) 50.4 (12.9) < 0.001
BMI, kg/m2 (SD) 26.7 (4.4) 27.4 (4.4) 0.08
Female sex, n (%) 54 (39.1) 213 (44.2) 0.29
Education, n (%)
 Primary school 28 (20.3) 73 (15.2)  
 High school/vocational training 68 (49.3) 247 (51.2)  
 Bachelor level 40 (29.0) 119 (24.7)  
 Master/PhD/other 2 (1.5) 43 (8.9) 0.01
Work status, n(%)
 Unemployed 27 (19.6) 119 (24.7)  
 Employed (or self-employed) 111 (80.4) 363 (75.3) 0.21
Physical activity, n (%)
 Low 35 (25.3) 92 (19.1)  
 Medium 51 (37.0) 190 (39.4)  
 High 52 (37.7) 200 (41.5) 0.27
  1. BMI body mass index
  2. aChi squared test for categorical variables and an unpaired t-test for continuous variables