Table 2.

Distribution of studied risk factors between the cases and controls

Questions	Supernumerary cases				Controls				P value
	Yes	%	No	%	Yes	%	No	%
Was the child breast fed?	108	90	12	10	120	100	0	0	0.0004*
Was the drinking water being mineral water?	12	10	108	90	0	0	120	100	0.0004*
Has the child been subjected to any sort of severe infection (oral infections such as gingivitis or abscess) in the first two years of his life?	6	5	114	95	0	0	120	100	0.0131*
Was the child under chemotherapy?	6	5	114	95	0	0	120	100	0.0131*
Has the child been subjected to traumatic Dental Injury (TDI) in the first 2 years?	18	15	102	85	12	10	108	90	0.2416
Did the child play with mobile phones or any other electronics?	18	15	102	85	36	30	84	70	0.0054*
Does the child live besides any center of radiation?	0	0	120	100	0	0	120	100	1.00
Does the child live besides any agriculture fields?	0	0	120	100	30	25	90	75	< 0.0001*
Does the child live besides industrial area?	0	0	120	100	12	10	108	90	0.0004*
Are the mother and father relatives (first-degree consanguine or second-degree consanguine)?	24	20	96	80	18	15	102	85	0.3081
Any other relatives with such problem?	0	0	120	100	0	0	120	100	1.00
Does any of the parents’ smoke?	72	60	48	40	66	55	54	45	0.4334
Does any of the parents take drugs?	0	0	120	100	0	0	120	100	1.00
Was the mother using medications or did she suffer from illness during pregnancy?	30	25	90	75	6	5	114	95	< 0.0001*
Was there a previous history of neoplastic disease in the family?	72	60	48	40	6	5	114	95	< 0.0001*

^*Statistically significant