. 2014 May 28;12(4):257–266. doi: 10.1111/idh.12085

Table 5.

Mean (SD) pre- and post-brushing plaque scores (TMQHPI) by brush group and plaque reduction group comparison

Brush (N)	Plaque score: mean (SD)		Plaque reduction: adjusted^* mean (SD)	P-value (95% CI)^†
Brush (N)	Prebrushing	Post-brushing	Plaque reduction: adjusted^* mean (SD)	P-value (95% CI)^†
Manual (90)	2.50 (0.366)	1.51 (0.349)^‡	1.05 (0.268)	<0.001 (0.09, 0.26)
Power (91)	2.80 (0.450)	1.56 (0.471)^‡	1.22 (0.301)
P-value	<0.001^§

SD, standard deviation; CI, confidence interval.

Treatment means adjusted for baseline plaque and brush by baseline plaque interaction (P = 0.095).

^†

P-value (CI) for plaque reduction group comparison using ancova with prebrushing plaque as covariate.

^‡

Sign test for change from pre- to post-brushing: P < 0.001.

^§

Two-sample t-test for unequal variances.