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Table 1 Basic characteristics of preschool children (n = 405)

From: Association between exposure to household smoking and dental caries in preschool children: a cross-sectional study

Variable

N (%)

Child’s sex

 Boys

218 (53.8)

 Girls

187 (46.2)

Age (years)

 3 ≤ 4.5

122 (30.1)

 4.5 ≤ 5.5

126 (31.1)

 > 5.5

157 (38.8)

Mother’s age at delivery (years)

 ≤ 24

26 (6.4)

 25–30

217 (53.6)

 ≥ 31

162 (40.0)

Maternal education level (years)

 ≤ 12

127 (31.4)

 13–15

197 (48.6)

 ≥ 16

81 (20.0)

Frequency of eating snacks (times/day)

 0

22 (5.4)

 < 2

352 (86.9)

 ≥ 2

31 (7.7)

Frequency of tooth brushing (times/day)

 0

21 (5.2)

 < 2

174 (43.0)

 ≥ 2

210 (51.8)

Feeding mode until 3 months old

 Breast

160 (39.5)

 Mixed

178 (44.0)

 Bottle

67 (16.5)

Current smoker at home (parent or household)

 Yes

190 (46.9)

 No

215 (53.1)

Presence of dental caries

 Yes

126 (31.1)

 No

279 (68.9)

Presence of untreated teeth

 Yes

105 (25.9)

 No

300 (74.1)

Number of dental caries

 0

279 (68.9)

 1

41 (10.1)

 ≥ 2

85 (21.0)

  1. N Number of participants