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Table 4 Input variables selected by the optimized (I.S.) system.

From: Placental determinants of fetal growth: identification of key factors in the insulin-like growth factor and cytokine systems using artificial neural networks

Variables IS 1° selection IS 2° selection
Chronological age of the mother at delivery X X
Sex of the newborn   
Gestational age X X
Other siblings X X
Number of other siblings   
Number of previous abortions   
Total placental protein content in lysates   
IGF-II concentration in placental lysates X X
IGFBP-2 concentration in placental lysates X X
IL-6 concentration in placental lysates   
TNF-α concentration in placental lysates   
IGF-I relative gene expression in placenta X X
IGF-II relative gene expression in placenta   X
IGFBP-1 relative gene expression in placenta   
IGFBP-2 relative gene expression in placenta X X
IL-6 relative gene expression in placenta   X