(1) This study examines sociodemographic and work-related variables to determine their impact on the knowledge of, attitudes toward, and skills in Evidence-Based Nursing Practice (EBNP). (2) The study included 830 nurses from four voivodships in Poland, Dolnośląskie, Łódzkie, Podlaskie, and Zachodniopomorskie and was conducted by the diagnostic survey method, using the questionnaire technique. The following research tools were applied in the study: an Evidence-Based Practice Profile Questionnaire (EBPPQ) and a survey questionnaire developed by the authors, containing questions on sociodemographic data and work-related variables. (3) Sociodemographic variables with an impact on the knowledge of, attitudes toward, and skills in EBNP include age, marital status, and educational background. Older nurses find it problematic to apply EBNP, and their level of relevant knowledge and skills is lower; whereas, those with university education possess the best EBNP-related skills, and they are also more eager to expand them and apply them in their work. The work-related variables with an impact on the knowledge of, attitudes toward, and skills in EBNP among nurses include work experience, which has a negative effect on applying EBNP and the skills associated with it. The type of school from which the nurses graduated and the nursing specialisation training also have a strong impact on expanding nurses’ competence in EBNP.

(1) Lockdown-related fatigue occurring during the COVID-19 pandemic is a complex problem that can be experienced in different social groups. The objective of the current study is to attempt to identify socio-demographic and lifestyle-related factors that determine the impact of fatigue on health in general as well as in physical, cognitive, and psychosocial terms and to determine whether, and to what extent, these were predictors of fatigue in nursing students during the COVID-19 pandemic. (2) The study was conducted by the diagnostic poll method between 20 March and 15 December 2021 among 894 nursing students at six Polish universities. To collect the data, a validated Modified Fatigue Impact Scale (MFIS) was used. (3) Students from the age group of ≤20 experienced a significantly greater impact of fatigue on health in general as well as in physical and cognitive terms. The study demonstrated a significant negative relationship between the year of study and the impact of fatigue on health in general terms (r = −0.12; p < 0.0001) and the analyzed health terms, on physical (r = −0.12; p < 0.0001), cognitive (r = −0.10; p < 0.002), and psychosocial (r = −0.07; p < 0.041). In predicting the impact of fatigue on health in general and physical terms, it was the variable related to a reduction in physical activity during the COVID-19 pandemic that had the greatest contribution, while for the cognitive and psychosocial functions, it was the number of meals consumed per day. (4) It is recognized that action is needed to reduce the impact of fatigue on student health by modifying the predictors related to student lifestyles.

Introduction: Medical students are particularly susceptible to nutritional deficiencies and mental health problems due to intensive study demands, stress, and lifestyle factors. Vitamin D3, vitamin B12, and folate deficiencies have been implicated in mental well-being, although evidence remains inconsistent. Objective: To assess the prevalence of vitamin D3, vitamin B12, and folate deficiencies among medical students at the University of Warmia and Mazury in Olsztyn, and to explore associations between serum concentrations of these vitamins, lifestyle factors, and self-reported well-being. Materials and Methods: The study included 97 medical students. Serum vitamin concentrations were measured using electrochemiluminescence immunoassay. Well-being was assessed with the WHO-5 Well-Being Index. Group comparisons were performed using non-parametric tests, and a Poisson regression model was applied as an exploratory analysis to examine associations between selected lifestyle factors and well-being. Results: Vitamin D3 deficiency was observed in 78% of students, folate deficiency in 20%, and vitamin B12 deficiency in 8%. In unadjusted analyses, differences in serum vitamin D3 and vitamin B12 concentrations were observed between students with lower and higher self-reported well-being, whereas folate concentrations did not differ. However, after correction for multiple testing using the Benjamini–Hochberg procedure, none of these associations remained statistically significant. Exploratory regression analysis suggested that physical activity and gender may be associated with well-being, while no association with vitamin D3 supplementation was observed. Conclusions: Vitamin D3, vitamin B12, and folate deficiencies were common among medical students. Exploratory analyses suggested differences in vitamin D3 and vitamin B12 concentrations across well-being groups; however, these findings did not remain significant after correction for multiple testing and should be interpreted with caution. Overall, the results indicate that lifestyle-related factors, particularly physical activity, may play a more prominent role in student well-being than serum vitamin concentrations alone. Further longitudinal studies are required to clarify these relationships.