Objective: To understand the correlation between depression, sleep quality and dental caries among college students in Chongqing, so as so provide reference basis for targeted health education. Methods: From January to June 2022, a multi stage sampling method was used to select 627 students from six colleges in Chongqing. According to the Fourth National Epidemiological Survey of Oral Health and World Health Organization standards, dental caries were examined and diagnosed. The Self Rating Depression Scale (SDS), Pittsburgh Sleep Quality Index (PSQI) Questionnaire and general situation questionnaire were adopted to investigate depressive symptoms and sleep quality of college students. Correlation analysis was performed to study the correlation between depression, sleep quality and dental caries. Results: The prevalence of dental caries among college students was 42.1%, and there was a statistically significant difference in dental caries prevalence among college students depending on their gender, major, body shape, parental education level, and family sources ( χ 2=14.49, 16.81, 7.82, 15.14, 7.34, P <0.05). The prevalence of depressive symptoms was 13.9%, and there was a statistically significant difference in SDS scores and depression prevalence among students of different body types ( χ 2=10.99, P <0.05). The PSQI score was (4.36±0.94) points, and the rate of poor sleep quality was 26.16%. Furthermore, there was a statistically significant difference in the PSQI score and rate of poor sleep quality among college students of different genders and body types ( χ 2=25.41, 17.59, P <0.05). There was a certain correlation between the occurrence of dental caries and poor sleep quality and depressive symptoms among college students, with contingency coefficients of 0.15 and 0.13, respectively ( P <0.05). Conclusion The prevalence of dental caries is high among college students in Chongqing. The occurrence of dental caries may be related to depression and sleep quality.

Objective: To investigate the nutritional status and associated factors of vitamin D among children aged 0 to 12 years old in Chongqing. Methods: From January 2019 to December 2021, 1 877 children aged 0-6 years who received regular child health care were randomly selected from Chongqing maternal and child health hospital, and 707 school age children were also selected from three primary school in Chongqing for investigation. The serum sample were collected for detecting serum 25 (OH) D level by chemiluminescence method, and the possible influencing factors of vitamin D deficiency (VDD) were analyzed. Results: The average serum 25 (OH) D concentration of children was (39.9±9.1) ng/mL with the positive rate of VDD was 14.59%. There were significant differences of VDD positive rate in different age, visiting time, visiting season, body shape, outdoor activity time and vitamin D supplementation (0-3 years old vs 4-6 years old vs 7-12 years old: 14.73% vs 22.19% vs 10.47%; visiting season: spring vs summer vs autumn vs winter: 12.97% vs 10.65% vs 14.86% vs 21.33%; pre COVID 19 epidemic vs post COVID-19 epidemic: 11.18% vs 17.08%; underweight or normal vs overweight or obesity: 12.34% vs 26.13%; adequate outdoor activity time vs inadequate:11.84% vs 16.27%; regular vitamin D supplementation vs irregular vitamin D supplementation: 11.71% vs 15.62% )( χ 2=26.17, 17.59, 30.98, 53.74, 9.60, 6.17, P <0.05). Underweight or normal body weight, sufficient outdoor activities and regular vitamin D supplementation were associated with less vitamin D deficiency with OR(OR95%CI ) at 0.68(0.55-0.84), 0.57 (0.25-0.77) and 0.62(0.44-0.85)( P <0.05). Conclusion The prevalence of VDD among preschool and school age children is high in Chongqing. Integrated prevention and control strategies incluing overweight or obesity control, increasing outdoor activities and oral vitamin D supplements should be taken.