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

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

  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  
  1. 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.