So, to recap, sequence generation and allocation concealment are domains relevant to the risk of selection bias.
These domains are related to the process researchers use to divide participants into groups. But bias is also possible after the group assignment process!
Once a study is underway, we’re more concerned with biases related to how study data are collected or measured. In this context, we use domains that are related to how researchers protect the integrity of their data (or information).
Let’s start with Masking/BlindIng