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Table 1 Characteristics of the subjects

From: A cross-sectional study on the association between vitamin D levels and caries in the permanent dentition of Korean children

Variables Classification Na %b
Sex Female 788 46.6
Male 900 53.4
Total 1688 100.0
Age (years) 10 531 31.1
11 583 33.4
12 574 35.4
Total 1688 100.0
Household income Low 375 24.9
Middle 882 53.1
High 414 22.0
Total 1671 100.0
Frequency of tooth brushing (per day) ≤ 1 211 12.8
2 969 58.1
3 426 25.3
≥ 4 73 3.8
Total 1679 100.0
Vitamin Dc (two classification) <  50 nmol 1038 61.7
≥ 50 nmol 650 38.3
Total 1688 100.0
Vitamin Dc (four classification) <  25 nmol 66 4.4
≤ 25 to < 50 nmol 972 57.3
≤ 50 to < 75 nmol 588 35.0
≥ 75 nmol 62 3.3
Total 1688 100.0
Caries experience in permanent dentition No 827 48.3
Yes 861 51.7
Total 1688 100.0
Permanent first molar caries experience No 867 50.8
Yes 821 49.2
Total 1688 100.0
  1. The data were analyzed using a complex weighted sample design
  2. a Values are expressed as the unweighted N
  3. b Values are expressed as the weight %
  4. c Values are expressed as 25(OH)D levels