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Table 1 Participant characteristics by strength quartile

From: Associations among knee muscle strength, structural damage, and pain and mobility in individuals with osteoarthritis and symptomatic meniscal tear

  Quartile 1 (weakest) Quartile 2 Quartile 3 Quartile 4 (strongest) P value
  Quadriceps Strength
Age 56 (6) 56 (7) 61 (7) 60 (8) 0.889
Sex      0.021
 Male 20% 40% 45% 64%  
 Female 80% 60% 55% 36%  
BMI 33 (7) 31 (6) 28 (4) 27 (4) 0.061
MOAKS Cartilage Damage Depth Score      0.169
 0 27% 41% 20% 36%  
 1 22% 22% 24% 25%  
 2 44% 29% 41% 34%  
 3 7% 8% 15% 5%  
MOAKS Cartilage Damage Size Score      0.011
 0 2% 2% 0% 6%  
 1 0% 6% 5% 9%  
 2 59% 63% 41% 52%  
 3 39% 29% 54% 33%  
K-L Grade      0.002
 0 12% 13% 9% 5%  
 1 12% 27% 12% 33%  
 2 39% 49% 39% 39%  
 3 37% 11% 39% 23%  
Quadriceps Strength (N/kg) 0.86 (0.28) 1.47 (0.13) 2.02 (0.20) 3.11 (0.57) < 0.001
KOOS Pain 44 (16) 53 (14) 55 (13) 62 (15) < 0.001
KOOS Symptoms 43 (15) 47 (15) 43 (15) 47 (13) 0.226
KOOS ADL 53 (19) 60 (17) 67 (14) 72 (16) < 0.001
TUG Test (s) 12 (5) 10 (4) 9 (3) 9 (2) 0.008
  Hamstrings Strength
Age 57 (7) 58 (7) 59 (8) 60 (7) 0.627
Sex      0.007
 Male 26% 33% 51% 63%  
 Female 74% 67% 49% 37%  
BMI 32 (7) 31 (6) 28 (5) 27 (4) 0.081
MOAKS Cartilage Damage Depth Score      0.840
 0 35% 30% 30% 28%  
 1 21% 16% 29% 28%  
 2 36% 43% 33% 35%  
 3 8% 11% 8% 8%  
MOAKS Cartilage Damage Size Score      0.544
 0 2% 2% 2% 5%  
 1 2% 8% 6% 5%  
 2 62% 54% 46% 52%  
 3 35% 36% 46% 38%  
K-L Grade      0.358
 0 11% 14% 9% 3%  
 1 15% 16% 29% 25%  
 2 47% 44% 33% 42%  
 3 27% 25% 29% 30%  
Hamstrings Strength (N/kg) 0.64 (0.17) 1.10 (0.12) 1.57 (0.15) 2.30(0.41) < 0.001
KOOS Pain 46 (16) 51 (14) 55 (14) 63 (14) < 0.001
KOOS Symptoms 44 (15) 45 (16) 44 (15) 47 (14) 0.925
KOOS ADL 55 (18) 60 (18) 66 (16) 74 (14) < 0.001
TUG Test (s) 12 (5) 10 (3) 9 (3) 9 (2) 0.005
  1. Continuous data presented as mean (standard deviation); categorical data presented percentage; MOAKS = MRI Knee OA Score; KOOS = knee injury and osteoarthritis outcomes score; BMI = body mass index; K-L = Kellgren-Lawrence; N = newtons; ADL = activities of daily living; TUG = Timed Up and Go; p-value corresponds to the difference in each outcome measure across quartiles of muscle strength