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Table 6 Linear regressions with S. sanguinis or S. mutans counts (transformed) as dependent variable. The initial crude model coincided with the adjusted model, as no covariates were finally added

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

Bacteria Factor Group b (95% CI) P
S. mutans Appliance Brackets Referent  
  Aligners − 2.47 (− 6.99 to 2.05) 0.28
Age NT   
Gender NT   
Time T0 Referent  
  T1 − 1.01 (− 1.96 to − 0.07) 0.04
  T2 − 0.84 (− 2.08 to 0.40) 0.18
s-PlI at T0 NT   
S. sanguinis* Appliance Brackets Referent  
  Aligners − 13.40 (− 19.19 to − 7.62) < 0.001
Age NT   
Gender NT   
Time T0 Referent  
  T1 3.21 (− 0.33 to 6.76) 0.08
  T2 0.60 (− 2.07 to 3.26) 0.66
s-PlI at T0 NT   
  1. *The following confounders had P > 0.20 in initial separate models and were not added in the adjusted model: age, gender, and s-PlI at T0. No significant interaction was found for time with appliance type (P = 0.11)
  2. The following confounders had P > 0.20 in initial separate models and were not added in the adjusted model: age, gender, and s-PlI at T0. No significant interaction was found for time with appliance type (P = 0.67)
  3. CI confidence interval, NT not tested, s-PlI simplified plaque index, b unstandardized regression coefficient