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Table 1 Characteristics of the study population stratified by interdental brush use

From: The use of an interdental brush mitigates periodontal health inequalities: the Korean National Health and nutrition examination survey (KNHANES)

VariablesInterdental brush useP-value
NonusersUsers
Unweighted NWeighted % (95% CIs)Unweighted NWeighted % (95% CIs)
Age (Mean ± SD)51.72 ± 16.99 46.67 ± 14.84 < 0.001
Sex< 0.001
 Male6,39950.5 (49.6–51.3)1,23445.0 (43.1–47.0) 
 Female7,89249.5 (48.7–50.4)2,05855.0 (53.0–56.9)
Education
  ≤ Elemental school4,00221.8 (20.8–22.8)47711.3 (10.2–12.6)< 0.001
 Middle school1,97013.6 (12.9–14.4)3118.3 (7.3–9.3)
 High school4,15134.6 (33.4–35.7)1,13837.7 (35.6–39.8)
  ≥ University or college3,621 1,24537.7 (35.6–39.8)
Income
 Low3,56625.7 (24.3–27.1)68721.4 (19.6–23.4)< 0.001
 Middle low3,61925.5 (24.3–26.8)78824.8 (22.8–26.8)
 Middle high3,57624.5 (23.3–25.8)85025.8 (23.9–27.9)
 High3,45524.3 (22.7–25.9)95228.0 (25.7–30.5)
Smoking0.883
 Everyday2,48121 (20.1–21.9)54420.8 (19–22.6)
 Occasionally2,63718.1 (17.4–18.9)56317.8 (16.3–19.4)
 Never9,17060.9 (60–61.8)2,18461.4 (59.4–63.4)
Flossinga< 0.001
 No11,75381.2 (80.3–82.1)2,38971.6 (69.6–73.5)
 Yes2,53818.8 (17.9–19.7)90328.4 (26.5–30.4)
Daily Toothbrushing0.013
 No2891.7 (1.5–1.9)401.0 (0.7–1.5)
 Yes13,99898.3 (98.1–98.5)3,25299.0 (98.5–99.3)
Dental clinic visitingb< 0.001
 No7,43152.9 (51.8–54.1)1,36943.4 (41.3–45.4) 
 Yes6,85047 (45.9–48.2)1,92356.6 (54.6–58.7)
Diabetesc< 0.001
 Normal7,24468.4 (67.3–69.6)1,95072.3 (70.3–74.2)
 Impaired fasting glucose2,56322.0 (21.0–23.0)59120.8 (19.1–22.6)
 Diabetes1,3209.6 (8.9–10.3)2466.9 (6–8)
Hypercholesterolemiad0.840
 Normal9,23885.7 (84.9–86.4)2,32085.8 (84.3–87.2)
 Abnormal1,83214.3 (13.6–15.1)46814.2 (12.8–15.7)
Hypertensione< 0.001
 Normal5,53050.3 (49–51.6)1,58956.3 (54.1–58.5)
 Prehypertension2,85623.5 (22.5–24.5)68223.9 (22.1–25.8)
 Hypertension3,96726.2 (25.2–27.3)71819.8 (18.2–21.5)
BMI relatedf0.695
 Underweight5484.8 (4.3–5.2)1354.8 (4.0–5.8)
 Normal8,02663.0 (62.0–64.0)1,94062.0 (60.0–64.0)
 Obese4,16632.2 (31.3–33.2)1,01233.1 (31.2–35.2)
Periodontitisg0.001
 Normal8,96773.6 (72.2–74.9)2,23176.1 (73.7–78.3)
 Periodontitis3,71426.4 (25.1–27.8)77223.9 (21.7–26.3)
  1. aFlossing was used usually
  2. bDental clinic visit within a year
  3. cImpaired fasting glucose was defined by 100 mg/dL ≤ Fasting blood glucose<126 mg/dL and diabetes was defined by fasting blood glucose≥126 mg/dL or drug or insulin
  4. dHypercholesterolemia was defined by total cholesterol≥240 mg/dL or drug
  5. ePrehypertension was defined by 140 mmHg>Systolic blood pressure ≥ 130 mmHg or 90 mmHg>diastolic blood pressure ≥ 85 mmHg and hypertension was defined systolic blood pressure ≥ 140 mmHg or diastolic blood pressure ≥ 90 mmHg or drug
  6. fUnderweighted was defined by BMI<18.5 and obese was defined by BMI ≥ 25
  7. gPeriodontitis was defined community periodontal index codes 3, 4