[COVID-19 fatality rate conditioned by risk factors in Mexico in 2020].

Background: The COVID-19 fatality rate exhibited significant variations during the first year of the pandemic, and such divergences seem to show different levels of risk of death among populations. Very few studies stratified fatality based on the presence or absence of risk factors.

Objective: To identify COVID-19 fatality rates conditioned by risk factors.

ABO blood groups are not associated to gestational diabetes mellitus in Mexican women.

Objectives: Some studies show an increased risk of gestational diabetes mellitus for ABO blood groups. Others find a lower risk or do not identify any association. Inconsistencies may be due to the heterogeneity in the control for confounding variables.

Less underestimaton of excess weight by the categorical than the visual method. Its determinants and feeding practices in Mexican mothers of children aged 2 to 12 years.

Introduction: perceived body weight refers to the subjectively assessed weight, which may not correspond to the objectively measured weight. Statistics show that 14 % to 83 % of parents misperceive their children's weight status, with a propensity for underestimation. Objective: we compared the accuracy of the visual versus the categorical method.

On the Possibility of Reproducing Utsu's Law for Earthquakes with a Spring-Block SOC Model.

The Olami, Feder and Christensen (OFC) spring-block model has proven to be a powerful tool for analyzing and comparing synthetic and real earthquakes. This work proposes the possible reproduction of Utsu's law for earthquakes in the OFC model. Based on our previous works, several simulations characterizing real seismic regions were performed.

Association between ABO blood groups and preeclampsia.

Objective: To determine the association between the ABO blood group and preeclampsia.

Methods: This is a case-control study that included patients with ( = 253) and without ( = 457) preeclampsia/eclampsia in Northeastern Mexico. Data were obtained from electronic medical records.