Table 3.

Linear mixed model repeated measure analysis

Fixed effects
Outcome variable	Time pointa (Pre versus post) Control group		Randomized group assignmentb (Control versus intervention)		Randomized group assignment Interaction with timec
	Effect (95% CI)	Significance	Effect (95% CI)	Significance	Effect (95% CI)	Significance
Oral hygiene self-care knowledge	0.82 (0.34 to 1.31)	0.0008	0.27 (-0.27 to 0.81)	0.8365	3.57 (2.88 to 4.26)	<0.0001
Oral hygiene self-care behaviour	0.48 (0.07 to 0.90)	0.0216	-0.23 (-0.75 to 0.30)	0.8006	3.10 (2.50 to 3.69)	<0.0001
OHL score	1.41 (0.53 to 2.29)	0.0014	0.66 (-1.93 to 3.25)	0.692	5.10 (3.85 to 6.34)	<0.0001
Plaque index	-0.07 (-0.21 to 0.27)	0.0962	0.04 (-0.08 to 0.17)	0.5171	-0.93 (-1.04 to -0.81)	<0.0001
Gingival index	-0.01 (-0.72 to 0.29)	0.1889	0.11 (-0.07 to 0.29)	0.7814	-0.93 (-1.06 to -0.80)	<0.0001

^aThis can be interpreted as the effect of control measurement (pre and post) on the outcome of interest.^bThis can be interpreted as the effect of random group assignment on the pre-intervention measurement on the outcome of interest.^cThis can be interpreted as the effect of actual intervention versus control intervention in the post-intervention measurement on the outcome of interest.