Occurrence of delayed-onset post-traumatic stress disorder: a systematic review and meta-analysis of prospective studies.

Objective: Post-traumatic stress disorder (PTSD) develops according to consensus criteria within the first 1-6 months after a horrifying traumatic event, but it is alleged that PTSD may develop later. The objective was to review the evidence addressing occurrence of PTSD with onset >6 months after a traumatic event (delayed-onset PTSD).

Methods: Through a systematic search in PubMed, EMBASE, and PsycINFO, we identified 39 studies with prospective ascertainment of PTSD.

Balancing sensitivity and specificity: sixteen year's of experience from the mammography screening programme in Copenhagen, Denmark.

Aim: To report on sensitivity and specificity from 7 invitation rounds of the organised, population-based mammography screening programme started in Copenhagen, Denmark, in 1991, and offered biennially to women aged 50-69. Changes over time were related to organisation and technology.

Methods: Individualized data were retrieved on outcome of screening mammography, assessment, surgery, and interval cancers.