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Table 2 Description of patient symptoms and knee pathology

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-valued
Frequency of knee paina, n (%)
 Never 3 (2.2) 6 (1.2)  
 Monthly 7 (5.1) 21 (4.4)  
 Weekly 15 (10.9) 55 (11.4)  
 Daily 88 (63.8) 313 (64.9)  
 Always 25 (18.1) 87 (18.1) 0.94
KOOS scoresb, mean (95% CI)
 Pain 52.3 (49.2–55.3) 55.6 (54.0–57.3) 0.06
 Symptoms 56.6 (53.5–59.7) 60.9 (59.2–62.5) 0.02
 ADL 60.0 (56.8–63.1) 64.8 (63.0–66.5) 0.01
 Sport/Rec 22.5 (19.2–25.9) 27.3 (25.3–29.3) 0.02
 QoL 37.9 (35.3–40.5) 42.7 (41.3–44.0) 0.001
Meniscal tissue quality, n (%)
 Non-degenerative 65 (47.1) 180 (37.3)  
 Degenerative 69 (50.0) 286 (59.3)  
 Undetermined 4 (2.9) 16 (3.3) 0.11
ICRS cartilage gradec, n (%)
 Medial compartment
  Grade 0 42 (30.4) 136 (28.2)  
  Grade 1 38 (27.5) 108 (22.4)  
  Grade 2 28 (20.3) 88 (18.3)  
  Grade 3 28 (20.3) 111 (23.0)  
  Grade 4 2 (1.5) 39 (8.1) 0.06
 Lateral compartment
  Grade 0 66 (47.8) 197 (40.9)  
  Grade 1 48 (34.8) 158 (32.8)  
  Grade 2 15 (10.9) 77 (16.0)  
  Grade 3 9 (6.5) 36 (7.5)  
  Grade 4 0 14 (2.9) 0.11
 Patellofemoral compartment
  Grade 0 54 (39.1) 174 (36.1)  
  Grade 1 45 (32.6) 122 (25.3)  
  Grade 2 19 (13.8) 85 (17.6)  
  Grade 3 16 (11.6) 73 (15.2)  
  Grade 4 4 (2.9) 28 (5.8) 0.20
  1. aSingle item from the KOOS pain subscale
  2. bScore ranging from 0 to 100, with 0 indicating extreme problems and 100 indicating no problems
  3. cICRS grad = International Cartilage Repair Society grading system. Grade 0 representing normal cartilage and 4 representing very severe cartilage lesion
  4. dChi squared test for categorical variables and an unpaired t-test for continuous variables
  5. ADL activities of daily living, Sport/Rec sport and recreational activities, QoL quality of life