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