The genetics of feto-placental development: A study of acid phosphatase locus 1 and adenosine deaminase polymorphisms in a consecutive series of newborn infants

Table 3 Correlation between birth weight and placental weight in relation to ACP₁ F isoform activity.

	ACP₁ F isoform activity
Sample	Medium-high (B+BA)		Medium-low (A+CA+CB)
	r	p*	r	p*
All subjects	0.209	0.001	0.687	0.000
Smoking
Yes	0.122	0.243	0.696	0.000
no	0.241	0.002	0.710	0.000
Significance of difference p**	0.000		0.750
Maternal age (yrs)
≤28	0.027	0.745	0.723	0.000
>28	0.478	0.000	0.640	0.000
Significance of difference p**	0.000		0.025
Gestational age (wks)
≤37	0.183	0.440	0.731	0.160
>37	0.228	0.000	0.655	0.000
Significance of difference p**	0.450		0.950
Birth order
1	0.305	0.001	0.672	0.000
≥ 2	0.158	0.060	0.703	0.000
Significance of difference p**	0.000		0.350
Sex
male	0.171	0.044	0.712	0.000
female	0.301	0.001	0.655	0.000
Significance of difference p**	0.000		0.170

Significance of difference between correlation coefficients has been calculated according to Snedecor and Cochran. p* refers to significance of correlation coefficient. p** refers to significance of difference between the two classes. For "All subjects" the difference of correlation coefficients between (B+BA) vs (A+CA+CB) i.e. 0.209 vs 0.687 is highly significant: p = 0.002.

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