Core outcome set (COS) | An agreed minimum set of outcomes that should be measured and reported in all trials in a specific condition [11] |
Outcome | A unique endpoint which attempts to describe health-related changes that occur secondary to a therapeutic intervention, e.g. hospital-acquired pneumonia |
Outcome domain | A collection of ‘outcomes’ which share common features, e.g. the outcome domain ‘respiratory complications’ would include outcomes such as ‘pleural effusion’, ‘hospital-acquired pneumonia’ and ‘atelectasis’ |
Outcome measurement instrument (OMI) | A method or tool used to measure an ‘outcome’ or an ‘outcome domain’ |
Outcome measurement instrument set | A collection of OMIs which are used to measure outcome domains in a COS |