Table 3. Pixel ratio’s associations.

Variable	Model	R2	P value
LDH	S	0.690	<0.0001
Cell count	Inverse	0.294	<0.0001
pH	S	0.427	<0.0001
Effusion pixels (mean)	Inverse	0.800	<0.0001

LDH, cell count, pH and effusion pixels (mean) were significantly associated with pixel ratio.