Why Are Outcomes Different for Registry Patients Enrolled Prospectively and Retrospectively? Insights from the Global Anticoagulant Registry in the FIELD-Atrial Fibrillation (GARFIELD-AF).

Background: Retrospective and prospective observational studies are designed to reflect real-world evidence on clinical practice, but can yield conflicting results. The GARFIELD-AF Registry includes both methods of enrolment and allows analysis of differences in patient characteristics and outcomes that may result. Methods and Results: Patients with atrial fibrillation (AF) and ≥1 risk factor for stroke at diagnosis of AF were recruited either retrospectively (n = 5069) or prospectively (n = 5501) from 19 countries and then followed prospectively. The retrospectively enrolled cohort comprised patients with established AF (for a least 6, and up to 24 months before enrolment), who were identified retrospectively (and baseline and partial follow-up data were collected from the emedical records) and then followed prospectively between 0-18 months (such that the total time of follow-up was 24 months; data collection Dec-2009 and Oct-2010). In the prospectively enrolled cohort, patients with newly diagnosed AF (≤6 weeks after diagnosis) were recruited between Mar-2010 and Oct-2011 and were followed for 24 months after enrolment. Differences between the cohorts were observed in clinical characteristics, including type of AF, stroke prevention strategies, and event rates. More patients in the retrospectively identified cohort received vitamin K antagonists (62.1% vs. 53.2%) and fewer received non-vitamin K oral anticoagulants (1.8% vs . 4.2%). All-cause mortality rates per 100 person-years during the prospective follow-up (starting the first study visit up to 1 year) were significantly lower in the retrospective than prospectively identified cohort (3.04 [95% CI 2.51 to 3.67] vs . 4.05 [95% CI 3.53 to 4.63]; p = 0.016). Conclusions: Interpretations of data from registries that aim to evaluate the characteristics and outcomes of patients with AF must take account of differences in registry design and the impact of recall bias and survivorship bias that is incurred with retrospective enrolment. Clinical Trial Registration: - URL: http://www.clinicaltrials.gov . Unique identifier for GARFIELD-AF (NCT01090362)

The Sociology of Emotions /

Title from publisher's bibliographic system (viewed on 25 Nov 2014)

Handbook of the sociology of emotions/ Edit.: Jan E. Stets

xiii, 657 hal.; 27 cm

Identity formation in street demonstrations

Every day, somewhere in the world, citizens take to the streets to vent their anger about grievances they share. A central mechanism in our understanding of protest behavior is identity formation. To experience shared grievances and emotions, a shared identity must develop. We address the question with whom protesters identify. Rather than examine whether dynamics of identification determine mobilization and participation, we will assess whether dynamics of mobilization and participation foster identification. We distinguish deductive and inductive identity formation. Taking the deductive route, people deduce a shared identity from a higher-order category membership they share; for example, being a union member. Taking the inductive route, a collective identity emerges as group members interact. Hypotheses derived from this conceptualization are tested. We present data on identification from a study of 81 demonstrations and 16,597 participants in eight European countries. We find that inductive and deductive identity formation have different antecedents