Table 6. Pearson correlation coefficient (r-value) analysis of the relationship between Hb levels and IVC density.

	r-value	95% CI	p-value
Combined patients	0.630	0.569–0.684	<0.0001
Sex
Male	0.600	0.512–0.676	<0.0001
Female	0.639	0.545–0.717	<0.0001
Anemia severity
None	0.316	0.205–0.419	<0.0001
Mild	0.109	−0.139–0.344	0.3877
Moderate	0.201	−0.044–0.422	0.1065
Severe	0.351	−0.109–0.687	0.1297