Clinic-level variations in contact tracing outcomes: protocol for a cross-sectional study of variation and case-mix adjustment in London, UK

Contact tracing around patients with infectious tuberculosis is used to identify further cases and interrupt transmission. Approaches to contact tracing are thought to vary between different clinical teams, but the extent of this variation and the importance of case mix are unknown. This project will use data from the London Tuberculosis Register to analyse the extent of variation in the number of contacts identified and the proportion that are assessed/screened, and use hierarchical modelling to test whether differences in case-mix explain any variation.