Table 2. Meta-regression for the potential source of heterogeneity.

Study characteristic	Relative Diagnostic odd ratio (95% CI)	P value
patient (< 60 patients vs. ≥ 60 patients)	1.56 (0.56, 4.33)	0.37
contrast mode (color/power Doppler vs. harmonic)	0.92 (0.33, 2.58)	0.87
country (Europe vs. other)	0.87 (0.34, 2.21)	0.76
analysis of images (quality vs. quantity)	0.93 (0.30, 2.92)	0.89

CI, Confidence interval.