Maternal Shoe Size and Infant Birth Weight: Correlation or Fiction?

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Figure 1.
Scatterplot of Infant Birth Weight and Maternal Shoe Size

Table 1.

Study Population Demographics

Table 2.

Correlation of Shoe Size and Birth Weight by Subgroup

Subgroup	N (%)	P Value	Pearson Coefficient
Entire sample	111	.93	0.01
Caucasian	82 (72)	.80	0.02
African American	14 (14)	.19	−0.36
Race: Other^*	15 (14)	.41	0.22
Primiparous	49 (44)	.97	0.01
Vaginal delivery	80 (72)	.53	0.07
Cesarean	27 (24)	.33	−0.19
Vacuum-assisted delivery	4 (4)	.83	−0.16
BMI <30	94 (85)	.77	0.03
BMI >30	17 (15)	.31	−0.25
Age >35	6 (5)	.01	0.89
Age <35	105 (95)	.67	−0.04