Table 3 Hierarchical logistics regression of the three level factors related to caries status

children level

 Age group (ref=3)

  4

1.73

(1.24, 2.43)

1.75

(1.24, 2.47)

1.75

(1.42, 2.17)

1.76

(1.43, 2.18)

  5

2.28

(1.83, 2.84)

2.30

(1.82, 2.90)

2.30

(1.75, 3.02)

2.32

(1.77, 3.05)

 Gender (ref= female)

  male

1.02

(0.85, 1.22)

1.02

(0.85, 1.22)

1.02

(0.88, 1.18)

1.02

(0.88, 1.18)

  Height

1.01

(0.99, 1.03)

1.01

(0.99, 1.03)

1.01

(0.99, 1.03)

1.01

(0.99, 1.03)

  Weight

1.03

(0.99, 1.06)

1.02

(0.99, 1.06)

1.02

(0.98, 1.06)

1.02

(0.98, 1.06)

 Tooth brushing >= 2/day(ref = No)

  Yes

1.01

(0.80, 1.28)

1.02

(0.80, 1.29)

1.02

(0.86, 1.21)

1.02

(0.86, 1.21)

 Tooth brushing before going to bed(ref=No)

  Yes

1.06

(0.79, 1.42)

1.03

(0.79, 1.33)

1.03

(0.81, 1.31)

1.03

(0.81, 1.32)

 Helping brushing everday (ref=No)

  Yes

0.71

(0.62, 0.80)

0.77

(0.67, 0.87)

0.77

(0.64, 0.91)

0.77

(0.65, 0.91)

 Toothpaste (ref=No)

  Yes

0.96

(0.78, 1.18)

0.97

(0.81, 1.16)

0.97

(0.81, 1.17)

0.96

(0.80, 1.16)

 Fluoride toothpaste (ref=No)

  Yes

1.02

(0.86, 1.21)

1.07

(0.88, 1.30)

1.07

(0.91, 1.26)

1.07

(0.91, 1.26)

 Eat snacks more than twice every week (ref=No)

  Yes

1.04

(0.84, 1.29)

0.98

(0.80, 1.21)

0.99

(0.84, 1.15)

0.99

(0.84, 1.15)

 Sweet beverage drinking (ref=No)

  Yes

1.44

(1.17, 1.76)

1.39

(1.15, 1.69)

1.39

(1.19, 1.63)

1.39

(1.19, 1.63)

 Flouoride vanish (ref=No)

  Yes

0.72

(0.64, 0.81)

0.76

(0.66, 0.87)

0.76

(0.62, 0.92)

0.76

(0.62, 0.93)

 Regular dental visit (ref=No)

  Yes

1.03

(0.77, 1.37)

1.13

(0.86, 1.49)

1.13

(0.95, 1.35)

1.14

(0.96, 1.36)

Family level

 Dental preventive policy knowledge (ref=No)

  Low

0.83

(0.57, 1.20)

0.82

(0.661.03)

0.82

(0.661.03)

  Median

0.97

(0.69, 1.35)

0.97

(0.76, 1.24)

0.97

(0.76, 1.24)

  High

1.01

(0.62, 1.65)

1.01

(0.74, 1.37)

1.01

(0.74, 1.38)

 Dental preventive knowledge (ref=No)

  Low

0.99

(0.76, 1.29)

0.99

(0.78, 1.25)

0.99

(0.79, 1.25)

  Median

1.01

(0.81, 1.26)

1.01

(0.84, 1.21)

1.02

(0.85, 1.22)

  High

0.82

(0.67, 1.01)

0.82

(0.66, 1.01)

0.82

(0.67, 1.01)

 Oral health knowledge (ref=No)

  Low

1.09

(0.83, 1.44)

1.09

(0.88, 1.35)

1.09

(0.88, 1.35)

  Median

0.95

(0.77, 1.19)

0.95

(0.78, 1.17)

0.95

(0.78, 1.17)

  High

0.96

(0.66, 1.37)

0.95

(0.76, 1.20)

0.96

(0.76, 1.20)

 Self-efficiency(ref=low)

  Median

1.02

(0.67, 1.55)

1.02

(0.66, 1.58)

1.02

(0.66, 1.57)

  High

0.82

(0.48, 1.40)

0.83

(0.54, 1.27)

0.82

(0.54, 1.26)

 Education level of caregiver (ref=below college)

  Above college

0.94

(0.73, 1.21)

0.94

(0.74, 1.21)

0.94

(0.74, 1.21)

 Caregivers' self-assessment of oral health (ref=High)

  Median

1.58

(1.35, 1.83)

1.57

(1.34, 1.85)

1.57

(1.34, 1.85)

  Low

1.79

(1.43, 2.23)

1.79

(1.42, 2.25)

1.79

(1.42, 2.25)

 Education level of parents (ref=both below college)

  One of parents below college

0.85

(0.66, 1.10)

0.85

(0.63, 1.14)

0.85

(0.63, 1.14)

  Both above college

0.67

(0.47, 0.98)

0.67

(0.49, 0.92)

0.67

(0.49, 0.93)

Community level

 Ratio of population and dentist

1.37

(0.98, 1.90)

1.31

(0.96, 1.79)

 Interval Odds Ratios (IOR)

(0.94, 1.99)

(0.98, 1.76)

 Ratio of area and dental clinic

0.96

(0.64, 1.42)

0.81

(0.53, 1.23)

 Interval Odds Ratios (IOR)

(0.66, 1.39)

(0.60, 1.09)

 Mean of oral health knowledge in the community

1.08

(0.75, 1.55)

 Interval Odds Ratios (IOR)

(0.80, 1.45)

 Mean of dental preventive knowledge in the community

0.66

(0.46, 0.95)

 Interval Odds Ratios (IOR)

(0.49, 0.89)