One-Health Consensus Reference Annotation Checklist (OH-CRAC) CRAC 5.1. Surveillance output generation This section describes how data from section 4.7 (Data aggregation) were transformed into surveillance statistics outputs such as indexes, seasonally adjusted statistics, e.g. trend, cycle, seasonal and irregular components, accessibility measures, etc., as well as the recording of quality characteristics such as coefficients of variation. The preparation of maps, GIS outputs and geo-statistical services can be included to maximise the value and capacity to analyse the statistical information.