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Table 3 Change in clinical oral health characteristic in the test and control group from baseline to 3-month follow-up

From: An educational intervention using the health belief model for improvement of oral health behavior in grade-schoolers: a randomized controlled trial

Measures

Test

Control

Difference (95% CI for difference FL—BL)

Difference (95% CI for difference test—control)

ANCOVA test

BL (n = 56)

FL (n = 55)

BL (n = 56)

FL (n = 54)

M (SD)

M (SD)

M (SD)

M (SD)

Test

Control

BL

FL

F (p value)

Papillary Bleeding Index (PBI)

1.4 (1.0)

0.7 (0.6)

1.8 (1.1)

1.7 (1.1)

− 0.7 (− 0.9–[− 0.5])**

− 0.1 (− 0.2–[− 0.0])*

− 0.4 (− 0.8–0.0)*

− 1.0 (− 1.3–[− 0.6])**

44.6 (< 0.001)

Decayed teeth (DT)

3.4 (2.5)

1.9 (1.8)

4.7 (3.4)

4.3 (3.0)

− 1.5 (− 2.0-[− 1.0]**

− 0.4 (− 0.7–[− 0.1])*

− 1.3 (− 2.4–[− 0.1])*

− 2.4 (− 3.3–[− 1.4])**

37.7 (< 0.001)

Missing teeth (MT)

0.8 (1.2)

0.9 (1.2)

0.6 (0.8)

0.9 (0.9)

0.1 (0.0–0.1)*

0.3 (0.2–0.4)**

0.2 (− 0.2–0.6)

− 0.0 (− 0.4–0.4)

10.7 (0.001)

Filled teeth (FT)

1.9 (2.1)

3.2 (2.4)

2.5 (2.3)

2.7 (2.3)

1.3 (0.9–1.6)**

0.2 (0.1–0.3)*

− 6.0 (− 1.4–0.2)

0.5 (− 0.4–1.4)

26.5 (< 0.001)

Total (DMFT)

6.2 (3.5)

6.0 (3.5)

7.8 (4.1)

7.9 (3.7)

− 0.2 (− 0.8–0.5)

0.1 (− 0.2–0.4)

− 1.6 (− 3.0-[− 0.2])*

− 1.9 (− 3.2-[− 0.5])*

2.68 (0.105)

  1. M mean, SD standard deviation, BL baseline, FL 3 months follow up, ANCOVA analysis of covariance, where the group included as independent variable, baseline measures as covariates and follow-up measures as the dependent variables. **p < 0.001; *p < 0.05