OP112 Use of outcome ‘change-scores’ in observational data are a potential source of inferential bias
PWG Tennant, KF Arnold, GTH Ellison, J Textor, SC Gadd, L Berrie, J Ellis, MS Gilthorpe
J Epidemiol Community Health Sep 2019, 73 (Suppl 1) A53; DOI: 10.1136/jech-2019-SSMabstracts.111