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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