Table 3.

Level of participant phone contamination.

	Students		P value	Professors		P value	Total		P value
	Engineering	Dental		Engineering	Dental		Engineering	Dental
†Level of The pollution	54	83	.001*	8	13	.001*	62	96	.01*
‡Overall CFU	28 ± 16.02	12 ± 10.32	.001*	6 ± 11.2	5 ± 23.12	.002*	16.12 ± 13.2	9.01 ± 16.21	.001*

CFU (Colony forming units);

^†Chi-square test;

^‡Independent sample t-test;

^*P value < .05 is significant.