Progress in Orthodontics

Table 4 Cross-tabulation of positive organisms’ findings (binary yes/no variable) and Fisher’s exact tests

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

Bacteria	Aligner	Bracket	P
	n/N (%)	n/N (%)
S. mutans
Present T0	13/15 (87%)	14/15 (93%)	1.00
Present T1	12/15 (80%)	12/15 (80%)	1.00
Present T2	12/15 (80%)	14/15 (93%)	0.60
L. acidophilus
Present T0	0/15 (0%)	0/15 (0%)	NC
Present T1	0/15 (0%)	1/15 (7%)	1.00
Present T2	0/15 (0%)	1/15 (7%)	1.00
S. sanguinis
Present T0	15/15 (100%)	15/15 (100%)	NC
Present T1	15/15 (100%)	15/15 (100%)	NC
Present T2	15/15 (100%)	15/15 (100%)	NC

n patients with event of interest, N patients assessed, NC non-calculable

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