Table 2.

Period comparison of plaque area (%) during 17 days of product use with a power toothbrush

Timepoint and treatment	Estimated mean (SE)	P-value versus period 2*	P-value versus period 3*
A.M. prebrush (carryover effect P-value = 0.0039)
Period 1	7.42 (1.16)	0.0021	0.0003
Period 2	10.21 (1.18)	0.5764
Period 3	10.70 (1.17)
A.M. post-brush (carryover effect P-value = 0.0013)
Period 1	2.98 (0.64)	0.0050	0.0016
Period 2	3.97 (0.65)	0.7279
Period 3	4.09 (0.65)
P.M. (carryover effect P-value = 0.0046)
Period 1	5.66 (0.80)	0.1369	0.0128
Period 2	6.44 (0.81)	0.3090
Period 3	6.98 (0.81)

SE, standard error.

^*Two-sided P-value; analysis of variance for crossover design.