Table II.

Prevalence of US-detected findings in people with knee OA/pain

	Number of studies	Number of subjects	Pooled prevalence (95% CI)	I2% (Pheter)	Ppub
People with knee OA/pain
Effusion	21	3266	51.5 (40.2–62.8)	97.5 (<0.0001)	0.082∗
Synovial hypertrophy	13	1785	41.5 (26.3–57.5)	97.6 (<0.0001)	0.026∗
DS	7	538	32.7 (8.34–63.24)	98.0 (<0.0001)	0.493∗
The general/normal population
Effusion	6	922	19.9 (7.81–35.34)	94.7 (<0.0001)	0.587∗
Synovial hypertrophy	4	601	14.5 (0–58.81)	98.7 (<0.0001)	0.118∗∗
DS	2	533	15.8 (3.08–35.36)	93.8 (<0.001)	–

CI: confidence interval; I²: inconsistency; P_heter: p for heterogeneity; P_pub: p for publication bias.

^∗Egger's test.

^∗∗Harbord's test.