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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