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Table 2 Prevalence ratios (PRs) and 95% confidence intervals (CIs) for decayed and/or filled teeth in relation to study variables

From: Household smoking and dental caries in schoolchildren: the Ryukyus Child Health Study

  Prevalence (%) Crude PR (95% CI)
Sex   
   Female 8624/10502 (82.1) 1.00
   Male 8348/10201 (81.8) 1.00 (0.98-1.01)
Age (y)   
   6-8 4989/6088 (81.5) 1.00
   9-11 6301/7522 (83.8) 1.03 (1.01-1.04)
   12-15 5712/7093 (80.5) 0.99 (0.97-1.01)
Region of residence   
   Nago city 3014/3540 (85.1) 1.00
   Naha city 13958/17163 (81.3) 0.96 (0.94-0.97)
Toothbrushing frequency (times/day)   
   <1 1372/1566 (87.6) 1.00
   1 3823/4518 (84.6) 0.97 (0.94-0.99)
   2 9688/11925 (81.2) 0.93 (0.91-0.95)
   ≥3 2089/2694 (77.5) 0.89 (0.86-0.91)
Use of fluoride   
   No 3705/4531 (81.8) 1.00
   Yes 13267/16172 (82.0) 1.00 (0.99-1.02)
Paternal educational level   
   Junior high school 1357/1540 (88.1) 1.00
   High school 7740/9160 (84.5) 0.96 (0.94-0.98)
   Junior college or vocational technical school 2518/3097 (81.3) 0.92 (0.90-0.95)
   University 5357/6906 (77.6) 0.88 (0.86-0.90)
Maternal educational level   
   Junior high school 900/1024 (88.0) 1.00
   High school 7654/9071 (84.4) 0.96 (0.94-0.98)
   Junior college or vocational technical school 6948/8704 (79.3) 0.91 (0.89-0.93)
   University 1473/1904 (77.4) 0.88 (0.85-0.91)
Daily sugar intake (g/1,000 kcal)   
   <3.0200 4054/5176 (78.3) 1.00
   3.0200-4.6510 4192/5176 (81.0) 1.03 (1.01-1.05)
   4.6511-6.8298 4335/5176 (83.8) 1.07 (1.05-1.09)
   ≥6.8299 4391/5175 (84.9) 1.08 (1.06-1.10)