Routinely collected health data, obtained for administrative and clinical purposes without
specific a priori research goals, are increasingly used for research. The rapid evolution and …

Objective To examine whether gender differences in primary care consultation rates (1) vary
by age and deprivation status and (2) diminish when consultation for reproductive reasons …

This paper demonstrates how compilation of medical and drug code lists for outcomes or
exposures of interest for studies using primary care databases can be carried out efficiently …

Missing data are ubiquitous in clinical epidemiological research. Individuals with missing
data may differ from those with no missing data in terms of the outcome of interest and …

The self controlled case series (SCCS) method is an epidemiological study design for which
individuals act as their own control—ie, comparisons are made within individuals. Hence, …

In pharmacoepidemiology, routinely collected data from electronic health records (including
primary care databases, registries, and administrative healthcare claims) are a resource for …

… Nick Freemantle professor of clinical epidemiology and biostatistics1 2, Louise Marston senior
research statistician1 2, Kate Walters senior clinical lecturer in primary care and epidemiology1 …

Context People with severe mental illness (SMI) appear to have an elevated risk of death from
cardiovascular disease, but results regarding cancer mortality are conflicting. Objective To …

Purpose To examine the effect of applying different data quality filters on the incidence of
disease and prescribing trends over time in a primary care research database and validate a …

Background Parkinson's disease has an insidious onset and is diagnosed when typical motor
features occur. Several motor and non-motor features can occur before diagnosis, early in …