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Table 1 Comparison of the general characteristics and physical activity of knee osteoarthritis patients and the general population aged ≥50 years

From: Physical activity status by pain severity in patients with knee osteoarthritis: a nationwide study in Korea

  Knee osteoarthritis patients (≥50 years of age)
(N = 1279)
General population (≥50 years of age)
(N = 7917)
P-value
n Weighted % n Weighted %
Sex
 Male 221 16.5% 3707 50.3% < 0.001
 Female 1058 83.5% 4210 49.7%  
Age
 50–59 years 154 15.1% 3226 52.3% < 0.001
 60–69 years 423 33.0% 2601 27.1%  
  ≥ 70 years 702 51.8% 2090 20.6%  
Monthly household income
 Low 677 53.1% 2189 25.4% < 0.001
 Moderate to low 290 23.5% 2053 26.2%  
 Moderate to high 157 12.9% 1716 23.4%  
 High 136 10.6% 1869 25.1%  
Education level
  ≤ Elementary 1010 80.4% 3402 41.4% < 0.001
 Middle school 152 11.3% 1422 19.7%  
 High school 92 6.8% 2033 26.5%  
  ≥ College 23 1.5% 1040 12.4%  
Marital status
 With spouse 504 42.5% 1427 17.8% < 0.001
 Without spouse 767 57.5% 6416 82.2%  
Depressive mood
 No 991 77.3% 6752 85.1% < 0.001
 Yes 279 22.7% 1128 14.9%  
Body mass index
  > 25 kg/m2 500 43.7% 4258 61.5% < 0.001
  ≤ 25 kg/m2 620 56.3% 2582 38.5%  
Number of comorbidities
 0 360 28.7% 3141 42.6% < 0.001
 1 441 35.2% 2574 31.7%  
 2 292 22.3% 1447 17.4%  
  ≥ 3 186 13.9% 755 8.3%  
Cigarette smoking
 Nonsmoker 1168 90.6% 6554 79.5% < 0.001
 Smoker 104 9.4% 1326 20.5%  
Alcohol consumption
 Never 700 54.1% 2957 34.2%  
 Low 345 27.3% 2114 25.1% < 0.001
 Moderate 150 11.6% 1574 21.0%  
 Excessive 77 7.0% 1232 19.7%  
IPAQ
 Inactive 752 61.1% 4200 53.3% < 0.001
 Minimally active 352 25.9% 2443 30.1%  
 HEPA active 166 13.0% 1233 16.5%  
Muscle-strengthening activity (2–3 days/week)
 Not met 1219 95.7% 6793 85.4% < 0.001
 Met 60 4.3% 1124 14.6%  
Flexibility activity (3–5 days/week)
 Not met 1081 84.2% 5870 73.8% < 0.001
 Met 198 15.8% 2047 26.2%  
Osteoarthritis expert panel recommendationa
 Not met 1014 81.4% 6071 76.8% 0.003
 Met 256 18.6% 1804 23.2%  
  1. IPAQ International physical activity questionnaire, HEPA Health-enhancing physical activity
  2. aOsteoarthritis expert panel recommendation: Performance of 30 min of moderate-intensity (50–70% maximal heart rate) physical activity or exercise at least 3 days a week