Table 2 Factors influencing the depth of cleaning of the tongue and palate without causing nausea: univariate analysis (N = 276)

7.30 ± 1.50

 − 2.698^a

0.010

7.45 ± 1.50

 − 2.569^a

0.013

6.65 ± 0.95

6.83 ± 1.00

6.83 ± 1.20

1.405^a

0.161

6.93 ± 1.28

0.189^a

0.850

6.65 ± 0.89

6.91 ± 0.88

7.19 ± 1.36

5.406^b

0.005

7.37 ± 1.10

6.72 ± 1.00

6.90 ± 1.11

6.104^b

0.003

6.32 ± 0.87

6.38 ± 0.93

6.44 ± 1.19

104.035^b

 < 0.001

6.76 ± 1.21

6.77 ± 1.10

6.96 ± 1.15

33.019^b

 < 0.001

7.03 ± 1.12

7.06 ± 1.17