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Table 5 Bacterial counts for each species (fifth root-transformed) at each time point and group with between-group testing with Mann-Whitney test (*) or t test for independent samples (+), according to normality of data

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

Bacteria   Aligner   Bracket Test P
S. mutans (transformed) n Mean (SD) n Mean (SD)   
 Count at T0 15 9.44 (6.06) 15 12.20 (7.24) + 0.27
 Count at T1 15 8.60 (6.05) 15 11.02 (7.73) + 0.35
 Count at T2 15 8.87 (6.14) 15 11.09 (6.71) + 0.35
L. acidophilus (transformed) n Median (IQR) n Median (IQR)   
 Count at T0 15 0 (0–0) 15 0 (0–0) * 1.00
 Count at T1 15 0 (0–0) 15 0 (0–0) * 0.76
 Count at T2 15 0 (0–0) 15 0 (0–0) * 0.76
S. sanguinis (transformed) n Mean (SD) n Mean (SD)   
 Count at T0 15 23.93 (11.67) 15 32.05 (5.24) + 0.02
 Count at T1 15 21.32 (10.55) 15 41.08 (10.02) + < 0.001
 Count at T2 15 22.43 (9.49) 15 34.75 (7.63) + 0.001
  1. IQR interquartile range, NT not tested, SD standard deviation