Factors Affecting Future Caries Occurrence Among Preschoolers in Northern Guangdong: A Longitudinal Study

Figures & data

Figure 1 Flowchart illustrating the entire recruitment process of the study population.

Table 1 The Number, Caries Incidence (%), and Δdmft (Mean) of Participants at Different Baseline Ages and Grouped by Sex

Baseline Age	No. of Participants
	Total	Male	Female
3 y	6000	3226	2774
4 y	5973	3205	2768
Baseline Age	Caries Incidence (%)
	Total	Male	Female
3 y	39.15	39.24	39.04
4 y	44.77	44.77	44.76
Baseline Age	Δdmft (Mean, SD)
	Total	Male	Female
3 y	1.293, 2.382	1.292, 2.376	1.293, 2.389
4 y	1.419, 2.416	1.419, 2.446	1.419, 2.382

Abbreviation: SD, standard deviation.

Table 2 Factors Related to a One-Year Increase in Dmft (Δdmft) and to Caries Occurrence Within One Year

Factors	RR (95% CI)^a	Z^a	RR (95% CI)^b	Z^b
Baseline dmft	1.120 (1.105, 1.135)	19.518	1.176 (1.158, 1.195)	20.179
Baseline DI-S^c	1.232 (1.147, 1.324)	5.743	1.336 (1.227, 1.457)	6.617
Baseline age	1.066 (1.004, 1.132)	2.088	1.124 (1.048, 1.205)	3.265

Notes: ^aFactors related to a one-year increase in dmft (Δdmft) by multivariate negative binomial regression analysis. ^bFactors related to caries occurrence within one year by multivariate logistic regression analysis. ^cParticipants whose DI of six teeth was not all “unrecorded” were included in the analysis.

Abbreviations: RR, risk ratio; CI, confidence interval.

Figure 2 The distribution of teeth with new-onset caries by tooth position for children in different baseline age groups.

Figure 3 The distribution of teeth with new-onset caries by tooth position for children in different baseline dmft score groups.

Figure 4 The frequency distribution of Δdmft.

Figure 5 Caries incidence (%) and number of new-onset caries per capita.

Figure 6 The proportion of children and teeth with new-onset caries.

Table 3 Association Between Baseline Dmft Scores and Number of Teeth with New-Onset Caries and Association Between Baseline Dmft Scores and Caries Occurrence

Baseline dmft	No. of Participants	RR (95% CI)^a	Z^a	RR (95% CI)^b	Z^b
0	7806	Ref		Ref
1	701	1.886 (1.674, 2.129)	10.349	2.407 (2.060, 2.813)	11.052
2	1219	2.080 (1.896, 2.285)	15.355	2.669 (2.362, 3.018)	15.700
≥3	2247	2.945 (2.742, 3.165)	29.513	4.482 (4.056, 4.957)	29.311

Notes: ^aAssociation between baseline dmft scores and number of teeth with new-onset caries by negative binomial regression analysis. ^bAssociation between baseline dmft scores and caries occurrence by logistic regression analysis.

Abbreviations: RR, risk ratio; CI, confidence interval.