What is pre-intervention and post-intervention month?

It depends on what exactly you are referring to... see the sites below:

http://www.google.com/search?hl=en&ie=ISO-8859-1&q=post-intervention+month&btnG=Google+Search&aq=f&oq=

It was about a study/research. So does it mean the month before the study and the month after?

Yes. The pre-intervention month is the month before you intervene in a situation. The post-intervention month must be the month following the end of the intervention. Check this site.

http://cat.inist.fr/?aModele=afficheN&cpsidt=19157804

The terms "pre-intervention" and "post-intervention" are commonly used in research and program evaluation studies to refer to different time periods within an intervention or study.

The pre-intervention phase refers to the period of time before the intervention or treatment is implemented. It is typically used to establish a baseline or benchmark, allowing researchers to measure and assess the state of a particular variable or outcome of interest before any intervention has been introduced. This phase is important because it provides a reference point to compare changes that occur after the intervention.

On the other hand, the post-intervention phase refers to the period of time after the intervention or treatment has been implemented. It allows researchers to measure and assess the effects of the intervention by comparing the post-intervention data to the baseline data obtained during the pre-intervention phase. This phase helps identify any changes, improvements, or outcomes that can be attributed to the intervention.

To determine the specific length of the pre-intervention and post-intervention periods, researchers typically consider the nature of the intervention, the timeline of the study, and the specific research objectives. The duration can vary depending on the research design, but it is important to have enough time to observe any meaningful changes resulting from the intervention.

In summary, pre-intervention and post-intervention months are time periods used in research studies to establish a baseline and measure the impact of an intervention or treatment. The pre-intervention period occurs before the intervention, while the post-intervention period occurs after the intervention has been implemented.