Prevalence and contributing factors of dental caries of 6-year-old children in four regions of China

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Introduction

Materials & Methods

Sample selection

Caries examination

Questionnaire

Data analysis

Results

Distribution of the studied children

Caries experience of the studied children

Results from the questionnaires

Results from the binary logistic analysis

Discussion

Limitations of the study

Conclusions

Supplemental Information

Clinical examination and questionnaire

DOI: 10.7717/peerj.6997/supp-1

Additional Information and Declarations

Competing Interests

The authors declare there are no competing interests.

Author Contributions

Zhaoyou Wang analyzed the data, contributed reagents/materials/analysis tools, prepared figures and/or tables, authored or reviewed drafts of the paper, approved the final draft.

Wensheng Rong conceived and designed the experiments, contributed reagents/materials/analysis tools.

Ying Zhang, Xiaojuan Zeng, Zhiqiang Li and Zhiwen Liu performed the experiments.

Human Ethics

The following information was supplied relating to ethical approvals (i.e., approving body and any reference numbers):

Stomatological Ethics Committee of Chinese Stomatological Association granted ethical approval to carry out the study (2014-003).

Data Availability

The following information was supplied regarding data availability:

Raw data is available as a Supplemental File.

Funding

This work was supported by the Science Popularization Department of Chinese Stomatological Association. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.

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