Table 3.

Factors affecting the incidence of congenital heart disease with the importance

Factors	Significance by Random Forest (Gini index)	Significance by PSO-SVM (Gain information)	Significance by support vector machine	Mean
Congenital extra cardiac anomalies	0.718	0.590	0.657	0.655
Chromosomal/genetic abnormalities	0.453	0.399	0.575	0.475
Hypothyroidism	0.124	0.140	0.248	0.170
thyroid drugs	0.08	0.141	0.219	0.146
Father age	0.221	0.202	0.380	0.267
Region	0.254	0.155	0.544	0.317
Positive Family history of CHD	0.112	0.178	0.333	0.207
Gender	0.160	0.189	0.220	0.189
Father’s job	0.182	0.186	0.317	0.228
Mother’s Job	0.363	0.141	0.479	0.327
Height	0.457	0.383	0.134	0.324
Weight	0.558	0.526	0.250	0.444