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Table 2 Distribution of selected characteristic in 1, 975 children

From: The association between low birth weight and dental caries among 11-to-13-year-old school age children in Ningbo, China

  Low birth weight Normal birth weight Total  
  Category (n) % (n) % (n) % P
Variable
Total   128 6.5 1847 93.5 1975 100  
Sex Female 61 47.7 901 48.8 962 48.1 .805
Male 67 52.3 946 51.2 1013 51.3  
Paternal educational level (years) < 9 47 36.7 745 40.3 792 40.1 .407
9-12 45 35.2 546 29.6 591 29.9  
> 12 36 28.1 556 30.1 592 30.0  
maternal exposure to tobacco smoke during pregnancy Active smoking 0 0.0 16 0.8 16 0.8 <.001
Passive smoking 62 48.4 141 7.6 203 10.3  
No smoking 66 51.6 1690 91.5 1756 88.9  
The frequency of sugary food intake (times/day) < 1 90 70.3 1286 69.6 1376 69.7 .782
1-2 28 21.9 383 20.7 411 20.8  
> 2 10 7.8 178 9.6 188 9.5  
Age at first brushing (years old) 2 29 22.7 480 26.0 509 25.8 .065
3 35 27.3 635 34.4 670 33.9  
> 3 64 50.0 732 39.6 796 40.3  
Toothbrushing frequency (times/day) 0 1 1.0 18 1.0 19 1.0 .398
1 38 21.9 450 24.4 488 24.7  
> 2 89 60.5 1379 74.7 1468 74.3  
Dental check-ups (times/year) 0 38 30.0 476 25.8 514 26.0 .583
1 57 44.5 842 45.6 899 45.5  
2 33 25.8 529 28.6 562 28.5  
Fluoride use   53 41.4 1016 55.0 1069 54.1 .003