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Table 2 Cohort characteristics of THA/TKA patients with and without current tobacco use

From: Current tobacco use is associated with higher rates of implant revision and deep infection after total hip or knee arthroplasty: a prospective cohort study

  Current tobacco user Past tobacco user or never used tobacco Odds ratio p-value
(n = 565) (n = 7361) (95 % confidence interval)
  N (%) N (%)   
Knee 228 (5.0 %) 4049 (95.0 %) 0.55 (0.46, 0.66) <0.001
Hip 337 (8.8 %) 3312 (91.2 %) 1.0 (ref)  
Male 326 (9.3) 3190 (90.7) 1.71 (1.44, 2.04) <0.001
Female 239 (5.4) 4171 (94.6) 1.0 (ref) a  
Age ≤60 354 (14.6) 2076 (85.4) 1.0 (ref) a  
 61–70 143 (5.7) 2379 (94.3) 0.38 (0.30, 0.46) <0.001
 71–80 56 (2.5) 2170 (97.5) 0.16 (0.12, 0.22) <0.001
 >80 12 (1.6) 736 (98.4) 0.10 (0.06, 0.18) <0.001
BMI <25 118 (10.0) 1059 (90.0) 1.0 (ref) a  
 25–29 157 (6.5) 2261 (93.5) 0.66 (0.51, 0.85) 0.001
 30–34 144 (6.6) 2025 (93.4) 0.70 (0.54, 0.91) 0.008
 35–39 90 (7.3) 1145 (92.7) 0.82 (0.61, 1.09) 0.17
 ≥40 51 (5.7) 838 (94.3) 0.65 (0.46, 0.92) 0.02
Implant fixation     
 Cemented 124 (5.4) 2185 (94.6) 0.90 (0.62, 1.29) 0.57
 Antibiotic/vacuum 151 (6.0) 2351 (94.0) 0.96 (0.69, 1.32) 0.81
 No cement 290 (9.3) 2825 (90.7) 1.0 (ref) a  
Charlson Index = 0 309 (8.3) 3425 (91.7) 1.0 (ref) a  
 >0 256 (6.1) 3936 (93.9) 0.76 (0.63, 0.90) 0.001
ASA class 1 18 (7.8) 213 (92.2) 1.0 (ref) a  
 2 393 (7.2) 5062 (92.8) 1.05 (0.64, 1.72) 0.85
 3 148 (6.7) 2047 (93.3) 1.00 (0.60, 1.68) 0.99
 4 5 (11.9) 37 (88.1) 1.72 (0.60, 4.95) 0.31
  1. ASA American Society of Anesthesiologist, BMI body mass index in kg/m2, Ref Reference category, SD standard deviation
  2. a the model was adjusted for the joint type (TKA vs. THA)