Table 4.

Comparison of change in the number of colonies in different intervals between ZnO and the control group

Time (hours)	Mean difference (I-J)	Standard Error	P-value	Confidence Interval
				Lower Bound	Upper Bound
2-4	-1.08	16.59	1.000	-44.82	42.66
4-6	20.16	11.76	0.325	-10.83	51.17
6-24	643.76	1.36	0.000*	283.74	1003.77

*Significant p< 0.001