Related Experiment Video
Updated: Jan 26, 2026

Cigarette Smoke Exposure in Mice using a Whole-Body Inhalation System
Published on: October 22, 2020
Prevalence of smoking in Brazilian schoolteachers, 2016
Rose Elizabeth Cabral Barbosa1, Giovanni Campos Fonseca2
1Núcleo de Estudos Saúde e Trabalho, Universidade Federal de Minas Gerais, Belo Horizonte, Brasil.
Abstract:
This cross-sectional study investigated the prevalence of smoking and associated factors in a nationally representative sample of 6,510 Brazilian schoolteachers. Data were obtained from telephone interviews using a questionnaire on sociodemographic information, health status, work absenteeism, and the characteristics of teaching work. Smoking was analyzed as a dichotomous variable using univariate and multivariate logistic regression. Overall smoking prevalence was 4.4%. Prevalence in men was 5.9% and was higher in those over 55 years of age (10.7%). Prevalence in women was 3.5% and was higher from 45 to 54 years of age (5.5%). The final multivariate model showed a negative association between smoking and female gender (OR = 0.46), being married or living with partner (OR = 0.53), occasional voice problems at work (OR = 0.64), and longer commuting time to and from school (OR = 0.58). The results showed positive associations between smoking and older age (OR = 2.59), living in the South (OR = 1.98) and Southeast Brazil (OR = 2.07), insufficient physical activity (OR = 1.66), and use of anxiolytics or antidepressants (OR = 2.46). Prevalence of smoking in Brazilian schoolteachers was relatively low. Unexpectedly, although cited as inadequate by the teachers, work conditions and demands in the schools did not reach statistical significance with smoking in the current study.
Related Concept Videos
Prevalence and Incidence
Prevalence indicates the proportion of individuals in a population who have a specific disease or health...
What is an Electrochemical Gradient?
The chemical gradient relies on differences in the abundance of a substance on the outside versus the inside of a cell and flows from areas of high to low ion concentration. In contrast, the electrical gradient revolves around an...
Measures of Central Tendency
The Nernst Equation
The interconnection between standard cell potentials and various thermodynamic parameters such as the standard free energy change ΔG° and equilibrium constant K has been previously explored. For example, a redox reaction involving zinc(II) and tin(II) ions at 1 M concentration with Eºcell = +0.291 V and ΔG° = −56.2 kJ is spontaneous.

