Conducted in Taizhou, China, between February and March 2022, the study surveyed 7,554 secondary school students using an anonymous cross-sectional design. The large sample size offers substantial statistical power to untangle complex associations between environmental and individual variables affecting adolescent depression. By deploying the widely used Patient Health Questionnaire (PHQ-9) with a cutoff score of 10 to define probable depression, the research offers a reliable lens into the prevalence and correlates of depressive symptoms within this population.

The study found that approximately 18.81% of the adolescents met the criteria for probable depression, underscoring a substantial mental health burden in this demographic. Notably, school climate and identification emerged as pivotal environmental determinants, displaying significant negative correlations with depressive symptoms. A positive school climate—characterized by supportive teacher-student relationships, a safe and inclusive atmosphere, and engagement opportunities—appeared to be a robust protective factor against depression. Similarly, students who identified strongly with their school community demonstrated lower depression risk, indicating the psychological benefits of belonging and social connectedness within educational settings.

Crucially, the investigation extended beyond simple associations to unravel the serial mediation mechanisms framing these relationships. Personal factors such as resilience, mindfulness, and loneliness played complex intermediary roles, providing nuanced pathways through which school environment influences mental health. Resilience, defined as the capacity to bounce back from adversity, and mindfulness, the practice of present-moment awareness without judgment, both acted as significant buffers against depression. Conversely, loneliness amplified risk, highlighting how social isolation undermines adolescent well-being.

The findings revealed three distinctive single-mediator pathways: resilience, mindfulness, and loneliness each partially mediated the protective effect of positive school climate on probable depression. These mediation effects accounted for substantial proportions of the total association, with loneliness demonstrating the largest effect size. Furthermore, two serial mediation pathways emerged, illustrating cascading effects—first through resilience or mindfulness and subsequently through loneliness—singularly contributing to decreased depressive symptoms. This sophisticated modeling sheds light on how nurturing personal psychological resources within supportive school environments can counteract loneliness and depression.

While similar mediation patterns were observed regarding school identification, the effect sizes were comparatively modest. This suggests that although participating in a school community is beneficial, more pronounced protective mechanisms stem from the broader school climate and personal adaptive traits. Importantly, these observations advocate for multi-level intervention strategies that simultaneously enhance environmental conditions and foster individual resilience and mindfulness to effectively mitigate adolescent depression.

The implications for educational policy and mental health programming are profound. Schools represent a feasible and impactful arena for preventive interventions given their central role in adolescent life. Initiatives that cultivate positive climates—through teacher training, anti-bullying campaigns, inclusive curricula, and student engagement—hold promise in diminishing depression rates. Concurrently, integrating resilience-building and mindfulness practices into school-based mental health curricula could strengthen students’ emotional regulation and social connectedness, thereby reducing the detrimental impact of loneliness.

Technically, this study used advanced statistical modeling to establish mediation effects, providing greater confidence in causal pathways beyond correlational findings. By quantifying effect sizes and dissecting multiple mediator chains, the research contributes methodologically rigorous evidence to the field. However, given the cross-sectional design, causal inference remains tentative, warranting longitudinal studies to validate and expand these discoveries over time.

Moreover, the cultural context of Chinese secondary education adds valuable geographic specificity, yet also calls for global comparative research to examine the universality or specificity of these mechanisms. Differences in school systems, societal norms, and technology exposure may influence how school climate and identification interact with personal psychological factors to affect adolescent depression internationally. Nonetheless, the patterns identified here resonate with broader psychological theories emphasizing the interaction between environment and individual traits in mental health outcomes.

This seminal research injects urgency into calls for enhancing adolescent mental health services, particularly in under-resourced educational settings. Depression at this stage can impair academic achievement, social functioning, and lifelong health trajectories, making effective early interventions crucial. The multi-dimensional framework proposed—linking positive environments to mental wellness via cultivated resilience and mindfulness—offers a potent blueprint for future public health initiatives, policy planning, and clinical practice.

In summary, this pioneering study forges a deeper understanding of how fostering a positive school climate and a sense of belonging can safeguard adolescents against depression, mediated by psychological resilience, mindful awareness, and social connectedness. As adolescence is formative for identity and well-being, investing in nurturing environments alongside personal development represents a strategic front in improving youth mental health worldwide.

The innovative insight into serial mediation mechanisms extends the frontier of adolescent mental health research, inviting educators, clinicians, and policymakers to reconceptualize prevention. By acknowledging the intertwined roles of environment and individual psychological factors, this study empowers a holistic, evidence-based approach to combatting adolescent depression that holds transformative potential across cultural and socio-economic landscapes.

Subject of Research:
Adolescent depression and its association with school climate, school identification, resilience, mindfulness, and loneliness among Chinese secondary school students.

Article Title:
The association between positive school climate and school identification and probable depression among Chinese adolescents: serial mediation mechanisms via resilience, mindfulness, and loneliness.

Article References:
Yu, Y., Wang, D.B., Du, M. et al. The association between positive school climate and school identification and probable depression among Chinese adolescents: serial mediation mechanisms via resilience, mindfulness, and loneliness. BMC Psychiatry 25, 905 (2025). https://doi.org/10.1186/s12888-025-07308-y

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DOI: https://doi.org/10.1186/s12888-025-07308-y

Understanding cleanliness satisfaction is not trivial; it intersects with multiple aspects of human psychology, including feelings of security, self-efficacy, and general mental health. While environmental cleanliness is typically assessed via objective standards—surface microbial counts, maintenance routines, and sanitation infrastructure—the ESL-AK pivots towards the individual’s subjective evaluation, capturing nuances that often go unnoticed by traditional measures. The implications span from improving community health interventions to enhancing everyday quality of life by acknowledging the psychological dimensions of sanitation environments.

The development of the ESL-AK scale represents an amalgamation of psychometric rigor and cultural sensitivity. The research team employed meticulous methods to ensure that the scale resonates with the lived experiences of adults in the Province of San Román, a region whose unique socio-cultural and environmental context shapes perceptions of cleanliness. The challenge lay not only in statistical validation but in creating an instrument adaptable enough to withstand potential cultural biases while still retaining the essential constructs of satisfaction and cleanliness.

Several layers of technical sophistication underline the ESL-AK’s creation. Traditional scale development typically proceeds through item generation, face validity, content validity, factorial analyses, and reliability testing. Puerta Quispe and colleagues adhered strictly to this pipeline, but with a robust incorporation of confirmatory factor analysis to validate the latent structure of the scale. This rigorous approach enhances the scale’s applicability beyond the sampled population, opening doors for cross-cultural adaptability and integration into comparative studies across different geographic and socio-economic contexts.

The study leveraged a representative adult sample from San Román, ensuring an inclusive cross-section of age, gender, and occupation characteristics to fortify the generalizability of findings. This is crucial as subjective cleanliness satisfaction is prone to demographic variations; for example, older adults may prioritize certain sanitation standards differently compared to younger cohorts. By validating the scale within this heterogeneous population, the research confidently asserts its relevance as a versatile tool for future psychological and public health research.

At its core, the ESL-AK divides subjective cleanliness satisfaction into several measurable dimensions, each reflecting a critical psychological or environmental facet. These facets likely include perceived hygiene of personal and communal spaces, psychological reassurance derived from clean surroundings, and satisfaction with sanitation services or infrastructure. The nuanced quantification of these aspects allows for a finely-grained understanding of how cleanliness, beyond the mere absence of dirt, contributes to communal cohesion and individual mental health.

One of the study’s groundbreaking revelations is the observed correlation between cleanliness satisfaction and psychosocial well-being indicators. While causality demands further longitudinal examination, the cross-sectional associations drawn within this sample suggest that individuals reporting higher cleanliness satisfaction also tend to display improved mood states, lower anxiety markers, and a heightened sense of community belonging. This aligns with heuristic theories positing cleanliness as a pillar of psychological security and environmental mastery, empowering individuals to engage more positively within their social milieus.

Technologically, the ESL-AK scale introduces innovative measurement techniques by adopting Likert-type item responses carefully optimized to minimize response bias. The psychometric analyses include Cronbach’s alpha for internal consistency and exploratory factor analyses to unveil the underlying factor structures, all indicative of the scale’s high reliability and structural validity. These statistical evaluations are augmented by item-response theory models, confirming each item’s discriminatory power and fitting the data robustly within expected psychometric parameters.

Moreover, the researchers performed cross-validation procedures, partitioning the sample into training and test subsets. This methodological robustness ensures that findings are not artifacts of a singular cohort but reflect consistent psychometric properties across independent datasets. Such stringent validation bolsters confidence in the ESL-AK as a replicable and dependable tool, lending itself both to academic investigations and practical public health applications.

In addition to psychometric properties, the study highlights how socio-environmental factors shape cleanliness satisfaction. Variables such as access to potable water, frequency of waste collection, and sanitation infrastructure robustness prominently modulate subjective perceptions. These findings underscore the importance of infrastructural investments—not merely for physical health benefits but as critical inputs shaping psychological wellness through enhanced cleanliness satisfaction.

The regional specificity of this study adds important dimensions to the global dialogue on environmental health. San Román, characterized by its unique highland climate and socio-economic profile, illustrates how geographical and cultural contexts inflect cleanliness perceptions. The ESL-AK’s demonstrated reliability in this setting suggests potential for adaptation and scaling to other similarly marginalized or geographically distinctive populations, inviting comparative analyses that could inform global sanitation strategies.

Transcending its immediate scientific contributions, the ESL-AK has consequential implications for policy and intervention. Understanding cleanliness satisfaction could assist municipal authorities in prioritizing sanitation projects responsive not only to epidemiological data but also to residents’ subjective well-being. Engaging communities through the prism of subjective scale scores could foster participatory sanitation governance, enhancing service delivery legitimacy and adherence to hygienic practices.

Furthermore, the ESL-AK’s utility extends to domains of mental health screening and psychosocial intervention. Cleanliness satisfaction, as an indicator of environmental comfort and perceived safety, might serve as an adjunct gauge in diagnosing environmental stressors contributing to anxiety or depression. Mental health professionals could integrate ESL-AK assessments into holistic care models, bridging environmental health with clinical psychological practice.

The significance of the ESL-AK is also reflected in its methodological transparency and open-access dissemination, facilitating replication and iterative refinement. The authors’ correction notice, published in BMC Psychology, is emblematic of scientific diligence, underscoring their commitment to rigorous standards and clear communication within the scientific community. Such transparency fosters multidisciplinary cooperation essential to tackling global sanitation and mental health challenges.

From a technological perspective, future advances could involve digitizing the ESL-AK, embedding it within mobile health platforms to enable real-time data collection and feedback. Coupling the scale with geospatial analytic tools might reveal neighborhood-level cleanliness satisfaction hotspots, informing targeted interventions. Such digital public health strategies could revolutionize how communities perceive and respond to their hygiene environments.

Concluding, the development and validation of the Cleanliness Satisfaction Scale (ESL-AK) marks a landmark in the psychometric assessment of environmental and psychological health intersections. Through rigorous validation in a culturally nuanced Peruvian population, this tool opens new pathways for understanding how cleanliness satisfaction influences well-being and community resilience. As global sanitation efforts aim for holistic health improvements, integrating subjective satisfaction metrics like the ESL-AK will be indispensable.

With mental health disorders on the rise globally and environmental quality increasingly recognized as a social determinant of health, instruments like the ESL-AK provide the nuanced insight necessary to design interventions that address both tangible and intangible dimensions of well-being. The pioneering work undertaken by Puerta Quispe, Pérez Alarcón, and Conde Rodríguez thus not only enriches academic discourse but also equips policymakers, health practitioners, and communities with a powerful tool to promote healthier, more satisfied populations worldwide.

Subject of Research: Development and validation of a psychometric tool measuring subjective cleanliness satisfaction among adults.

Article Title: Correction: Development and validation of the cleanliness satisfaction scale (ESL-AK) in a sample of adults from the Province of San Román, Perú.

Article References:
Puerta Quispe, Á., Pérez Alarcón, K. & Conde Rodríguez, I. Correction: Development and validation of the cleanliness satisfaction scale (ESL-AK) in a sample of adults from the Province of San román, Perú. BMC Psychol 13, 830 (2025). https://doi.org/10.1186/s40359-025-03201-1

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