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Table 2 Comparison of the effusion area identified by ultrasonography according to the 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

Effusion area (mm2) Total
N = 254
KLG 2
N = 180
KLG 3
N = 57
KLG 4
N = 17
Average value 49.6 ± 52.4 39.2 ± 40.2 69.5 ± 59.3* 93.0 ± 91.3*
95 % CI 43.1, 56.1 33.3, 45.1 53.8, 85.3 46.0, 140.0
  1. Statistical analysis was by analysis of variance (Tukey post-hoc test); * P ≤ 0.01 compared to Kellgren-Lawrence grade (KLG) 2. The effusion area of each knee joint was measured (n = 254 knees). CI confidence interval