The relationship between different types of caries and periodontal disease severity in middle-aged and elderly people: findings from the 4th National Oral Health Survey of China

Table 4 Association between the number of teeth with dental caries and periodontal disease severity in the 65- to 74-year-old group

DFT (mean ± SD)	Degree of periodontitis			Model 1 ^a	Model 2 ^b	Model 3 ^c
DFT (mean ± SD)	CAL ≤ 3 mm N = 830	CAL = 4–5 mm N = 1428	CAL ≥ 6 mm N = 1859	P value and OR (95% CI)	P value and OR (95% CI)	P value and OR (95% CI)
Type ABC	3.34 ± 4.21	4.07 ± 4.24	4.24 ± 4.35	< 0.001 1.03 (1.02,1.04)	< 0.001 1.04 (1.03,1.05)	< 0.001 1.04 (1.03,1.05)
Type A	1.39 ± 2.12	1.50 ± 2.10	1.10 ± 1.70	< 0.001 0.93 (0.9,0.96)	0.001 0.95 (0.92,0.98)	0.002 0.95 (0.92,0.98)
Type B	1.82 ± 3.37	2.27 ± 3.30	2.71 ± 3.66	< 0.001 1.06 (1.04,1.08)	< 0.001 1.06 (1.04,1.08)	< 0.001 1.05 (1.03,1.07)
Type C	0.14 ± 0.57	0.31 ± 1.03	0.43 ± 1.12	< 0.001 1.26 (1.19,1.33)	< 0.001 1.28 (1.21,1.35)	< 0.001 1.28 (1.21,1.35)

95% CI, 95% Confidence intervals
^aModel 1: DFT was included as the only independent variable in the ordered logistic regression analysis
^bModel 2: Social economic status, sex, area, education level, and household income per capita were added to Model 1
^cModel 3: Oral health-related behaviours such as smoking status, tooth brushing frequency, use of dental floss, use of a toothpick and alcohol consumption were added to Model 2

ISSN: 1472-6831