Table 4.

Total number of colonies at different stages.

Stage I	Stage J	Mean difference (I – J)	Standard error	P	95% confidence interval
					Lower limit	Upper limit
Prior to treatment (mo)	1	−4.24868	7.690483	0.58143	−16.9745	8.477102
	2	−23.9302	6.985228	0.000785*	−35.4889	−12.3714
	3	−14.337	7.154153	0.046811*	−26.1753	−2.49871
	6	−7.51905	7.520372	0.318954	−19.9633	4.925242
After 1 mo	After 2 mo	−19.6815	6.43432	0.002619*	−30.3286	−9.03433
	After 3 mo	−10.0883	6.617323	0.129414	−21.0383	0.861654
	After 6 mo	−3.27037	7.011637	0.64157	−14.8728	8.332093
After 2 mo	After 3 mo	9.593162	5.782633	0.099146	0.024387	19.16194
	After 6 mo	16.41111	6.230003	0.009289*	6.102052	26.72017
After 3 mo	After 6 mo	6.817949	6.418834	0.289807	−3.80358	17.43947

P < 0.05 indicates significant difference.