Lung cancer screening in limited resource regions: the 3rd Brazilian Early Lung Cancer Trial (BRELT3/mobile ProPulmão).

Aims: To describe tomographic findings in a high-risk lung cancer population in resource-limited Brazilian areas, quantify pulmonary nodules and lung cancer frequency, analyze challenges in lung cancer screening within the Brazilian public health system, assess lung function in individuals with moderate or severe emphysema, and evaluate the role of community health agents in recruiting high-risk populations.

Methods: This is a prospective, single-arm, longitudinal observational study involving individuals aged 50-80 years, current or former smokers with a smoking history of at least 20 pack-years, undergoing low-dose computed tomography (LDCT) with a 12-month follow-up. Screening results are classified according to Lung-RADS v2022 standards, with those rated as 3 or 4 undergoing further diagnostic assessments.

Determinants of smoking experimentation and initiation among adolescent students in the city of Salvador, Brazil.

Objective: To identify the factors associated with smoking experimentation and initiation among adolescent students (11-14 years of age).

Methods: A cross-sectional, population-based study involving adolescent (middle and high school) students at public and private schools in the city of Salvador, Brazil. A multiple-stage sampling protocol was used.

Reliability of a questionnaire on substance use among adolescent students, Brazil.

Objective: To analyze reliability of a self-applied questionnaire on substance use and misuse among adolescent students.

Methods: Two cross-sectional studies were carried out for the instrument test-retest. The sample comprised male and female students aged 1119 years from public and private schools (elementary, middle, and high school students) in the city of Salvador, Northeastern Brazil, in 2006.