The 2011 Census extract for COVID-19 research does not include wholly imputed persons, late returns, duplicate persons, and termind=2 observations. Termind=2 observations are those students who have an alternative term-time address. This process avoids double counting students, keeping only the records associated with their primary term-time address. STATS PBPP approval is required as well as health and social-care PBPP. Application form available from statistics.enquiries@gov.scot or your eDRIS research co-ordinator.