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Table 2 Results of negative regression for dmft> 0 among the surveyed preschool children in Zhejiang Province

From: Dental caries and associated factors in 3 to 5-year-old children in Zhejiang Province, China: an epidemiological survey

 

IRRa (95% CIb)

Wald (Χ2)

P

Age groups

   

 3-year-old

0.44 (0.34,0.59)

31.47

<0.001

 4-year-old

0.78 (0.58,1.04)

2.84

0.09

 5-year-old

–––

–––

–––

BMI

 0–25% percentile

2.20 (1.62,3.00)

25.14

<0.001

 (11.0–14.31)

 25–50% percentile

1.85 (1.37,2.49)

16.11

<0.001

 (14.31–15.29)

 50–75% percentile

1.86 (1.36,2.54)

14.97

<0.001

 (15.29–16.54)

 75–100% percentile

–––

–––

–––

 (16.54–23.61)

Seafood consumption frequency

 Twice a week or more

1.26 (0.97,1.63)

3.07

0.08

 Once a week

1.48 (1.08,2.02)

6.09

0.01

 Seldom or never

–––

–––

–––

Infant breastfeeding duration

 0–6 months

0.55 (0.34,0.88)

6.25

0.01

 7–12 months

0.59 (0.37,0.93)

5.22

0.02

 13–18 months

0.80 (0.49,1.32)

0.78

0.38

18 months

–––

–––

–––

Sleeping hours

  ≥ 12 h

0.66 (0.43,1.01)

3.67

0.06

 10–12 h

0.66 (0.51,0.85)

10.70

0.001

  ≤ 10 h

–––

–––

–––

  1. aIncidence rate ratio
  2. b95% confidence interval