Table 7.

Prevalence of ORAEs in contaminated area before and after interventions

	ORAEs	No ORAEs	Incidence of ORAEs
Pre-interventions	79	108	73.15%
Post-interventions	221	665	33.23%
Total	300	773	38.81%
χ2	χ2 = 22.95
P	P < 0.001