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On 12 August 2025, the committee issued a formal Declaration of Non-Responsibility (Nicht-Zust\u00e4ndigkeitserkl\u00e4rung) under BASEC-ID Req-2025-00997, confirming that the project does not fall within the scope of the Swiss Human Research Act (Humanforschungsgesetz, HRA; SR 810.30) and that approval by a Swiss ethics committee is therefore not required. The primary rationale provided by the committee was that the research focuses on resource and staffing planning in the intensive care unit and does not aim to generate occupational-medicine findings on stress levels or associated health impairments of the participating personnel. The requirement for informed consent was accordingly waived. All data had been routinely collected for internal quality assurance prior to the present analysis. Nursing workload data (subjective ratings, shift-level NEMS scores, number of nurses and patients per shift) were available only in fully aggregated and anonymised form at the level of the shift and could not be traced back to individual nurses. Patient-related data were limited to the aggregated NEMS score per shift and contained no direct or indirect identifiers. No biological material was collected or analysed. The study was conducted in accordance with the Declaration of Helsinki and its later amendments, as well as all applicable Swiss data-protection provisions.","order":1,"name":"Ethics","label":"Ethics approval and consent to participate","group":{"name":"EthicsHeading","label":"Declarations"}},{"value":"Not applicable.","order":2,"name":"Ethics","label":"Consent for publication","group":{"name":"EthicsHeading","label":"Declarations"}},{"value":"Use of a large language model (LLM) was restricted to language correction and was not applied for data interpretation or any other purpose. During the preparation of this work the authors used ChatGPT (OpenAI) in order to improve language and readability. After using this tool, the authors reviewed and edited the content as needed and take full responsibility for the content of the published article.","order":3,"name":"Ethics","label":"Declaration of generative AI and AI-assisted technologies in the manuscript preparation process","group":{"name":"EthicsHeading","label":"Declarations"}},{"value":"The authors declare no competing interests.","order":4,"name":"Ethics","label":"Competing interests","group":{"name":"EthicsHeading","label":"Declarations"}}],"article-number":"967"}}