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Table 1 Comparison of the demographic values in subjects grouped by severity of knee osteoarthritis identified by radiography

From: Evaluation of a quantitative measurement of suprapatellar effusion by ultrasonography and its association with symptoms of radiographic knee osteoarthritis: a cross-sectional observational study

  Total KLG 2 KLG 3 KLG 4
n = 127 n = 81 n = 33 n = 13
Age 68.3 ± 9.8 65.8 ± 9.8 71.5 ± 7.4a 75.4 ± 9.3a
Body mass index 23.2 ± 3.0 22.6 ± 2.7 23.6 ± 2.7 26.3 ± 3.7ab
Kellgren-Lawrence grade 4.7 ± 1.1 4.0 ± 0 5.5 ± 0.5a 7.3 ± 0.5ab
Effusion area 99.2 ± 89.7 73.9 ± 65.8 139.3 ± 94.8a 155.3 ± 139.8a
KOOS pain 83.6 ± 20.3 91.3 ± 12.2 73.1 ± 24.3a 62.8 ± 23.7a
KOOS symptom 84.5 ± 19.0 91.3 ± 13.3 75.9 ± 20.4a 64.3 ± 23.5a
KOOS ADL 88.8 ± 16.6 94.7 ± 10.0 80.4 ± 19.9a 74.0 ± 22.2a
KOOS sport 72.8 ± 30.1 85.1 ± 21.1 55.8 ± 29.3a 40.0 ± 36.1a
KOOS QOL 70.3 ± 27.1 82.4 ± 17.1 49.6 ± 28.3a 47.1 ± 29.6a
  1. Statistical analysis by analysis of variance (Tukey post-hoc test); a P ≤ 0.01 compared to Kellgren-Lawrence grade (KLG) 2; b P ≤ 0.01 compared to KLG 3. The effusion area and KLG values are the sum of these values for both knees. KOOS knee injury and osteoarthritis outcome scale, ADL activities of daily living, QOL quality of life