Table 2.

Pearson correlation matrix for placental size measures^*

Placental size measure	Placental weight	Placenta-fetus weight ratio	Largest diameter	Smallest diameter	Area	Thickness	Volume	Density
Placental weight	1
Placenta-fetus weight ratio	0.70	1
Largest diameter	0.50	0.28	1
Smallest diameter	0.50	0.26	0.55	1
Area	0.56	0.30	0.87	0.88	1
Thickness	0.32	0.22	−0.04	0.02	−0.01	1
Volume	0.62	0.37	0.55	0.61	0.66	0.73	1
Density	0.05	0.09	−0.11	−0.23	−0.19	−0.46	−0.45	1

Strong (|r| ≥ 0.5) or moderate (0.3 ≤ |r| <0.5) correlations are shown in bold.

^*P-value<0.05 for all pairwise correlation coefficients.