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Table 5 Correlation between birth weight and placental weight in relation to ADA1 phenotypes.

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

  ADA1 phenotypes
Sample ADA11 (ADA12/1+ADA12)
  r p* r p*
All subjects 0.289 0.000 0.552 0.000
Smoking     
Yes 0.275 0.003 0.484 0.036
no 0.288 0.000 0.589 0.000
Significance of difference p** 0.300   0.150  
Maternal age (yrs)     
≤28 0.104 0.181 0.679 0.000
>28 0.559 0.000 0.341 0.120
Significance of difference p** 0.000   0.000  
Gestational age (wks)     
≤37 0.292 0.187 0.922 0.078
>37 0.286 0.000 0.560 0.000
Significance of difference p** 0.900   0.350  
Birth order     
1 0.449 0.000 0.572 0.001
≥ 2 0.212 0.009 0.543 0.003
Significance of difference p** 0.000   0.700  
Sex     
male 0.268 0.000 0.359 0.078
females 0.344 0.000 0.692 0.000
Significance of difference p** 0.000   0.000  
  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 ADA11 and (ADA12/1+ADA12) i.e. 0.289 vs 0.552 is statistically significant: p = 0.04.