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Table 7 Description of anthropometric measurements and DMFT at 12, 15, and 18 years

From: Longitudinal association between obesity and periodontal diseases among secondary school students in Hong Kong: a prospective cohort study

Variable

12-years-old (1)

15-years-old (2)

18-years-old (3)

P-value

Multiple comparison

Mean (SD)

Median

Mean (SD)

Median

Mean (SD)

Median

BMIa

   

< 0.001***

(1) < (2) = (3)

n = 281

19.66 (3.36)

18.82

14.31–30.05

21.03 (3.43)

20.29

15.24–34.02

21.15 (3.60)

20.37

15.00–35.89

  

WCa

   

< 0.001***

(3) < (1) < (2)

n = 282

69.82 (8.62)

67.65

52.50–100.10

72.53 (8.97)

70.20

57.4–104.50

68.86 (8.99)

67.00

53.0–111.00

  

WHRa

   

< 0.001***

(3) < (2) < (1)

n = 282

0.81 (0.05)

0.81

0.67–0.97

0.79 (0.06)

0.78

0.63–0.98

0.77 (0.06)

0.76

0.58–1.09

  

WHtRa

   

< 0.001***

(3) < (2) = (1)

n = 281

0.45 (0.05)

0.44

0.34–0.61

0.44 (0.05)

0.43

0.34–0.64

0.42 (0.05)

0.40

0.32–0.66

  

TRSKFa

   

< 0.001***

(1) < (2) = (3)

n = 179

10.69 (4.20)

9.50

4.20–29.3

14.92 (6.66)

13.80

4.40–44.1

15.78 (6.29)

15.30

4.70–39.60

  
 

n (%) (≤ 50% index teeth with CPI = 0)

n (%) (≤ 50% index teeth with CPI = 0)

n (%) (≤ 50% index teeth with CPI = 0)

  

CPIb

   

< 0.001***

(1) < (2) < (3)

n = 282

119 (42.2%)

158 (56.0%)

191 (67.7%)

  
  1. BMI body mass index, WC waist circumference, HC hip circumference, WHR waist-hip ratio, WHtR waist-height ratio, TRSKF triceps skinfold thickness, DMFT the number of decayed, missing and filled permanent teeth, CPI community periodontal index
  2. aNon-parametric tests, related-samples Friedman’s two-way analysis of variance by ranks
  3. bNon-parametric test, related-samples Cochran’s Q test
  4. Valid number of cases of height in 15 years old was 281; valid number of cases of TRSKF in 12 years old was 179
  5. *P < 0.05, **P < 0.01, ***P < 0.001