Progress in Orthodontics

Table 7 Explorative regression analyses with simplified plaque index or S. sanguinis counts as dependent variable and stratified by appliance subgroup

From: Salivary levels of cariogenic bacterial species during orthodontic treatment with thermoplastic aligners or fixed appliances: a prospective cohort study

			Aligners		Brackets
Outcome	Factor	Group	b (95% CI)	P _SG	b (95% CI)	P _SG	P _interaction
s-PlI	Age	Per year	− 0.06 (− 0.23 to 0.11)	0.47	− 0.18 (− 0.43 to 0.07)	0.16	0.08
	Gender	Female	Referent		Referent
	Gender	Male	0.25 (−0.61 to 1.10)	0.57	0.95 (0.23 to 1.67)	0.01
	Time	T0	Referent		Referent
		T1	− 1.37 (− 2.04 to − 0.69)	< 0.001	0.18 (− 0.48 to 0.84)	0.60
		T2	− 0.54 (− 1.29 to 0.21)	0.16	0.61 (− 0.49 to 1.71)	0.28
	s-PlI at T0	Per unit	0.53 (0.16 to 0.89)	0.005	0.20 (− 0.13 to 0.54)	0.24
S. sanguinis	Age	Per year	NT		NT		0.11
	Gender	Female	NT		NT
	Gender	Male	NT		NT
	Time	T0	Referent		Referent
		T1	− 2.61 (− 4.89 to − 0.33)	0.03	9.03 (3.71 to 14.35)	0.001
		T2	− 1.50 (− 4.47 to 1.46)	0.32	2.70 (− 1.58 to 6.97)	0.22
	s-PlI at T0	per unit	NT		NT

b unstandardized regression coefficient, CI confidence interval, NT not tested, P_interaction P value for time differences between appliance subgroups (interaction time with appliance), P_SG P for effects within each subgroup, s-PlI simplified plaque index

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