Introduction Depression is twice as common in women men, especially the young age group. Multiple factors may contribute to this gender difference. Growing attention being focused on role of sex hormones, including those hormonal contraception (HC). Some recent studies have indicated a higher risk depression among using HC, although results are inconclusive. Objectives The aim study examine ass...

OBJECTIVE To investigate potential associations between dietary patterns (defined using factor analysis) and difficulty conceiving. DESIGN Case-control study nested in a Spanish cohort of university graduates (Seguimiento Universidad de Navarra [SUN] Project). SETTING Female university graduates all over Spain participating in the SUN Project. PATIENT(S) A total of 485 women, aged 20-45 y...

A frequently used study design within epidemiology is large cohort studies. In some situations additional information which is not included in the cohort, for instance biological material stored in biobanks, is required. The availability of such material is usually limited and might be very expensive to analyze for the entire cohort. A reasonable strategy is therefore to restrict the study samp...