Table 3.

Summary of mean and change from baseline Modified Gingival Index over time

Timepoint	N	Prophylaxis			No Prophylaxis
		Mean MGI ± SD	Mean Change from baseline MGI ± SD	P-value*	Mean MGI ± SD	Mean Change from baseline MGI ± SD	P-value*
Baseline	38	2.00 ± 0.26			2.03 ± 0.29
Week 1	38	1.63 ± 0.38	−0.36 ± 0.26	<0.0001	1.91 ± 0.33	−0.12 ± 0.19	0.0014
Week 2	38	1.76 ± 0.32	−0.23 ± 0.19	<0.0001	1.91 ± 0.39	−0.13 ± 0.23	0.0004
Week 4	37	1.82 ± 0.33	−0.18 ± 0.24	<0.0001	1.93 ± 0.35	−0.11 ± 0.19	0.0028
Week 6	37	1.65 ± 0.36	−0.35 ± 0.25	<0.0001	1.74 ± 0.43	−0.30 ± 0.26	<0.0001
Week 12	37	1.98 ± 0.34	−0.02 ± 0.23	0.5050	2.03 ± 0.33	−0.01 ± 0.18	0.8896

^*P-value from adjusted mean.