Browsing by Subject "Cross-sectional studies"
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(2007)Objective: To assess the relationship between early tobacco and alcohol use and the risk of marijuana consumption among schoolchildren. Methods: A cross-sectional study comprising data from the Fourth National Study on ...
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(Elsevier, 2015)Objective: to investigate the prevalence and risk factors associated with wheezing in infantsin the first year of life.Methods: this was a cross-sectional study, in which a validated questionnaire (Estudio Interna-cional ...