. 2016 Aug 4;18:181. doi: 10.1186/s13075-016-1078-y

Table 3.

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

	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^**

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