[Inappropriate eating habits are associated with hypercholesterolemia in adolescents].

Background: Lifestyle changes in adolescents are characterized by a poor diet which means rich in fat and cholesterol, and it is associated with the development of dyslipidemia, which is considered one of the main risk factors for cardiovascular disease in adulthood.

Objective: To identify the association between risk eating habits and the presence of dyslipidemia in adolescents at the primary health care level.

Material And Methods: Cross-sectional, analytical, and retrospective study, which included adolescents aged 10-17 years.

[ROC curves: general characteristics and their usefulness in clinical practice].

The use of diagnostic tests to determine the presence or absence of a disease is essential in clinical practice. The results of a diagnostic test may correspond to numerical estimates that require quantitative reference parameters to be transferred to a dichotomous interpretation as normal or abnormal and thus implement actions for the care of a condition or disease. For example, in the diagnosis of anemia it is necessary to define a cut-off point for the hemoglobin variable and create two categories that distinguish the presence or absence of anemia.

[Factors associated with benzodiazepines dependence in insomnia patients].

Background: The use of benzodiazepines as a treatment for insomnia can have side effects such as impaired coordination causing falls in adults and even dependence.

Objective: To assess the factors associated with dependence on benzodiazepines in patients with insomnia.

Methods: Observational, cross-sectional, prospective, and analytical study, at the first level of care.

[Severe post-COVID-19 dialysis dependence and inpatient acute kidney injury].

Background: COVID-19 challenged our health system, within the broad clinical spectrum acute kidney injury was presented as a catastrophic event, acute kidney injury and the risk of dependency after dialysis constitute a clinical problem with high repercussions in the funcionality.

Objective: To identify risk factors for dialysis dependence after acute kidney injury from COVID-19.

Material And Methods: A retrospective observational cohort study was carried out at the Hospital de Especialidades del Centro Médico Nacional Siglo XXI, of the Mexican Institute of Social Security, from March 2020 to March 2021.

[Comment on article "Risk factors associated with preterm birth in a second level hospital"].

Preterm birth is a worldwide problem with a high economic impact and morbimortality in children. Therefore, the literature has focused on finding modifiable factors associated with this entity, such as the study "Risk factors associated with preterm birth in a second level hospital," which concluded that "100% of risk factors associated with preterm birth are potentially preventable". Our team reanalyzed the results and found in the regression model that premature rupture of membranes was the only variable associated with preterm birth.

[Diagnostic performance of the FINDRISC questionnaire to identify insulin resistance in adults].

Background: Insulin resistance (IR) is a state prior to the development of type 2 diabetes (T2D) and it is reversible with lifestyle modification. However, it is underdiagnosed due to the difficulty in its measurement.

Objective: To evaluate the diagnostic performance of the FINDRISC questionnaire to identify IR.

Risk factors associated with SARS-CoV-2 pneumonia in the pediatric population.

IntroducciÓn: Hasta ahora existen pocos estudios sobre las características clínicas de la población pediátrica con neumonía por COVID-19. El objetivo de este estudio fue analizar los datos que se asocian con el desarrollo de neumonía en niños y adolescentes con infección por SARS-CoV-2 en México.

MÉtodos: Se llevó a cabo un análisis secundario de la base de datos de la Dirección General de Epidemiología del Gobierno Mexicano.

Back to the clinic. Methods II. The Architecture of Clinical Research. Subject interaction, maneuvers and disease throughout time.

Medicine is characterized by the application of the scientific method through clinical judgment, by correct interpretation and use of the clinical course and/or natural history of the disease; its best description is observed in the architecture of clinical research. Through a temporal sequence, this model explains the phenomenon of causality with three sections: baseline status, maneuver, and outcome. The baseline status assesses who the patient is, where does he come from, his general conditions, the diagnosis, stage and aggressiveness of the pathology, complications, previous therapies, socioeconomic-cultural level, habits, therapeutic indications or contraindications, and the expected evolution is anticipated.

[List of Ethical Principles for Medical Research Involving Human Subjects].

The ethical principles of a research proposal are not contained only in a paragraph or in the informed consent form; actually, they are an essential part of the whole protocol from the beginning to the end. In a complementary manner to the regulatory and educative documents, our objective in this article is to propose a checklist of questions so researches can ensure they have included the necessary information and precautions to meet the ethical considerations that are required for every research with human beings, which shall be called List of Ethical Principles for Medical Research Involving Human Subjects. We propose questions that researchers must ask themselves when they compose the background, justification, objectives, research question, hypothesis, selection criteria, sample size calculation, sampling, research design, statistical analysis plan, ethical aspects, publication plan, and references.

Factors associated with death in children with COVID-19 in Mexico.

Introduction: Most children affected by SARS-CoV-2 are reported to be asymptomatic, and COVID-19-related mortality in them is low; in Mexico, there is a lack of information on the subject in this population group.

Objective: To assess the risk factors associated with mortality in Mexican children with COVID-19.

Method: Secondary analysis of the General Directorate of Epidemiology database.

De vuelta a la clínica: sin justificación no existe pregunta de investigación que valga.

A clinical research question requires the concurrence of clinical experience and knowledge on methodology and statistics in that who formulates it. Initially, a research question should have a structure that clearly establishes what is that which is being sought (consequence or outcome), in whom (baseline status), and by action of what (maneuver). Subsequently, its reasoning must explore four aspects: feasibility and reasonableness of the questioning, lack of a prior answer, relevance of the answer to be obtained, and applicability.