Evidence of associations between type-specific bullying victimization and suicidal ideation and suicide attempt among adolescents is scant. This study examined these associations among middle and high school students in China. A cross-sectional study of 27,030 students with mean age of 15.7 ± 1.7 years, including 13,946 boys and 13,084 girls, was carried out between April and June 2022. The prevalence of suicidal ideation and attempt was 19.7 % and 2.9 %, respectively. 30.0 % (95%CI: 28.8-31.1) of students reported being bullied (i.e., bullying victimization) in the past 30 days, and the corresponding figs. (95%CI) for verbal bullying, relational bullying, property-related bullying, physical bullying, and cyberbullying were 11.0 % (10.4-11.7), 2.8 % (2.5-3.0), 1.9 % (1.7-2.2), and 5.7 % (5.3-6.0), respectively. After adjustment for socio-demographic status, lifestyle factors, academic performance, self-reported health and mental health, compared to those who reported not being bullied in the past 30 days, the odds ratios (95%CI) for suicidal ideation and suicide attempt among students who reported being bullied were 1.75 (1.60-1.90) and 2.01 (1.63-2.52), respectively. The corresponding odds ratios (95%CI) for verbal bullying were 1.77 (1.61-1.93) and 2.09 (1.67-2.61), respectively, for relational bullying were 1.77 (1.57-2.00) and 2.31 (1.79-2.98), respectively, for property-related bullying were 1.88 (1.48-2.37) and 2.44 (1.60-3.70), respectively, for physical bullying were 1.79 (1.30-2.47) and 2.86 (1.67-4.90), respectively, and for cyberbullying were 2.02 (1.71-2.39) and 2.83 (2.08-3.84), respectively. All types of bullying victimization are strongly associated with both suicidal ideation and suicide attempt among middle and high school students.

Objective: This study aimed to explore the relationship between breakfast consumption frequency and both depression and anxiety symptoms among middle and high school students in Eastern China. Methods: In this school-based cross-sectional study, 27,001 middle and high school students were investigated in 2022. Multivariable logistic regression models were used to examine the relationship between breakfast consumption frequency and both depression and anxiety symptoms. Results: The percentages of students who consumed breakfast daily, 6 days/week, 4–5 days/week, and ≤3 days/week were 71.0% (95%CI: 69.9–72.2), 8.3% (95%CI: 7.8–8.6), 11.9% (95%CI: 11.2–12.6), and 8.8% (95%CI: 8.2–9.5), respectively. After adjusting for socio-demographic and lifestyle factors, academic performance, self-reported health, and bullying victimization, compared to those consuming breakfast daily, the odds ratios (95%CI) for depression symptoms were 1.32 (1.15–1.52) for those consuming breakfast 6 days/week, 1.66 (1.49–1.84) for those consuming breakfast 4–5 days/week, and 1.74 (1.54–1.97) for those consuming breakfast ≤3 days/week, respectively (p < 0.001). The corresponding figures for anxiety symptoms were 1.31 (1.14–1.51), 1.35 (1.20–1.52), and 1.43 (1.23–1.66), respectively (p < 0.001). Conclusions: Breakfast skipping is common among middle and high school students in Eastern China. The frequency of breakfast consumption is inversely associated with both depression symptoms and anxiety symptoms among adolescents.

Background: The association between air pollutants and mortality from chronic kidney disease (CKD) remains to be further investigated. This study aims to examine the impact of air pollutant exposure on CKD mortality in individuals. Methods: This study utilized an individual-level, time-stratified case-crossover design to evaluate the association between short-term exposure to air pollutants (PM _2.5 , SO ₂ , O ₃ , and NO ₂ ) and mortality from CKD. The deceased population was identified from the mortality surveillance data of the Zhejiang Provincial Center for Disease Control and Prevention. For each decedent, we collected air pollutant concentrations on the day of death (case day) and on matched control days within the same month. This design inherently controls confounding factors such as age, place of residence, and seasonality. Results: The study found that short-term exposure to all four air pollutants was associated with an increased risk of CKD mortality. The excess risk (ER) per interquartile range (IQR) increase in pollutant concentrations was evaluated across different lag periods. Using multi-day moving average lags (calculated as the mean exposure from the current day up to the specified preceding day), the most prominent ERs were observed for PM2.5 at lag02 (ER: 15.16%, 95% CI: 12.69–17.68), SO ₂ at lag03 (ER: 8.80%, 95% CI: 5.95–11.72), O ₃ at lag01 (ER: 5.67%, 95% CI: 2.07–9.39), and NO ₂ at lag03 (ER: 13.66%, 95% CI: 9.12–18.39). After adjusting for interactions with other pollutants, the associations for SO ₂ and PM _2.5 remained significant. Additionally, the study found that this association was influenced by factors such as marriage, and season (cold vs. warm). Conclusions: This study revealed a significant association between short-term exposure to air pollutants and CKD mortality in the population of Zhejiang Province. These findings provide novel evidence for understanding the impact of environmental factors on kidney disease and suggest a need for governmental authorities to enhance the monitoring and control of air pollution to mitigate the health burden on the elderly.