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Table 3 Correlation between the effusion area identified on ultrasonography, demographic data, and KOOS subscales

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

  Age Sex BMI KLG K-pain K-sym K-ADL K-sports K-QOL
Effusion area 0.187* −0.158 0.142 0.422** −0.382** −0.370** −0.373** −0.441** −0.433**
Age   0.076 0.135 0.353** −0.143 −0.175* −0.304** −0.346** −0.179*
Sex    −0.016 0.203* −0.095 −0.160 −0.112 −0.039 −0.153
BMI     0.293** −0.306** −0.247** −0.266** −0.310** −0.211*
KLG      −0.473** −0.468** −0.472** −0.555** −0.536**
K-pain       0.819** 0.843** 0.791** 0.877**
K-sym        0.754** 0.743** 0.789**
K-ADL         0.902** 0.798**
K-sports          0.755**
  1. Statistical analysis was by Spearman rank correlation coefficient; * P ≤ 0.05; ** P ≤ 0.01. The effusion area and KLG values are the sum of these values for both knees. KLG Kellgren-Lawrence grade, K-pain knee injury and osteoarthritis outcome scale (KOOS) pain subscale, K-sym KOOS symptom subscale, K-ADL KOOS activity of daily living subscale, K-sports KOOS sport and recreation subscale, K-QOL KOOS quality of life subscale