No increase in body mass index in a healthy Chinese population during the COVID-19 outbreak (preprint)

Background The Coronavirus Disease 2019 (COVID-19) epidemic continues to spread worldwide. This study aimed to investigate (1) the change in body mass index (BMI) before and after the COVID-19 outbreak and (2) the impact of behaviours on BMI during the quarantine period. Methods We recruited 197 healthy adults who underwent a physical examination within two months after the Spring Festival holidays of 2018, 2019 and 2020 in Taizhou, China. Of them, 138 respondents answered a questionnaire on lifestyle behaviours during the quarantine period. Univariate analysis and multiple logistic regression models were used to analyse the impact of behaviours during the quarantine period on changes in BMI. Results The average BMI of the population increased from 2018 to 2019 (P<0.05) and then decreased from 2019 to 2020 (P>0.05). The proportion of BMI increase after the COVID-19 outbreak was significantly lower than that in the previous year (41.6% vs. 59.4%, paired χ2=8.151, P=0.002). Young age and living in an urban area were risk factors for a BMI increase in men from 2019 to 2020 (P<0.05), while the habit of eating late-night snacks increased the risk of higher BMI in women (OR=6.11, 95% CI: 1.87–19.98, P<0.05). Conclusions The results of this study demonstrated that there was no significant increase in BMI among the healthy population during the COVID-19 outbreak. Late-night snacking should be discouraged to prevent BMI increases, especially in at-risk women. Level of Evidence: Level III，well-designed cohort

Lymphocytopenia and neutrophilia deteriorate at the lowest oxygenation index timepoint in COVID-19 patient (preprint)

BackgroundCoronavirus disease 2019 (COVID-19) spread throughout the world and caused hundreds of thousands of infected people to death. However, the pathogenesis of severe acute respiratory syndrome coronavirus-2 (SARS COV-2) is poorly understood. The objective of this study is to retrospectively explore the pathogenesis of COVID-19 from clinical laboratory findings, taking disease progression into account.MethodsA single-centered, retrospective study was carried out, which included moderate (n=76) and severe COVID-19 cases (n=22). The difference of laboratory findings from blood routine examination and hepatorenal function test were retrospectively evaluated between the state of moderate and severe. The disease progression was indicated by oxygenation index.ResultsAge is a risk factor for disease progression from moderate to severe. Lymphocytopenia, neutrophilia, liver and kidney function decreasement occurred in severe patients on admission, compared with moderate patients. Lymphocytopenia and neutrophilia deteriorated at the lowest oxygenation index timepoint in the severe patients. And the oxygenation index was associated with ratio of lymphocyte and neutrophil in COVID-19 patients.ConclusionsLymphocytopenia and neutrophilia, which deteriorate in the progression of severe patients, are the main pathogenesis of COVID-19. More measures need to be taken to control lymphocytopenia and neutrophilia in severe COVID-19. Oxygenation index presented potentiality as predictor on the progression of COVID-19.