👉 In the context of observational studies, a preobservational study is a type of research design where researchers do not observe or record any changes in the subject being studied before their data collection begins. This allows for a more objective and unbiased way to assess outcomes and effects. Preobservational studies are particularly useful when it comes to understanding the effects of interventions on specific populations, as they can help identify potential confounders that may have influenced the outcome or the study's results. However, preobservational
