Attrition in weight management is a common barrier cited in interventions across all populations. Women with PCOS may experience additional challenges, with attrition as high as 46 percent.

Grand Valley State University

Attrition refers to the loss of participants during a study. This is a particularly significant issue in longitudinal research, where dropout rates are often high and tend to increase as the study progresses over time. Participants may leave a study for numerous reasons, including major life events like moving, marriage, illness, or death, or they may simply decide to stop participating. This reduction in participants can threaten a study's validity, introduce bias, and weaken the power of its statistical conclusions.

Attrition

Ee, C., Pirotta, S., Mousa, A., Moran, L., & Lim, S. (2021). Providing lifestyle advice to women with PCOS: An overview of practical issues affecting success. BMC Endocrine Disorders, 21(1). https://doi.org/10.1186/s12902-021-00890-8

Providing lifestyle advice to women with PCOS: An overview of practical issues affecting success

Both IB and CB intervention produced individuals with significant reduction in subjectively reported stress (SUDS) following mini-relaxations. While individuals in CB group reported less dramatic SUDS reduction, reduction in stress is highly significant, meaning it might not be as effective but is still valuable and cost effective way of reaching individuals who don't have access. Attrition (drop-out rates) was high in all groups. The 2nd and 3rd hypotheses (individuals would experience reductions in globally measured indices of distress immediately after completing intervention and 1 month later) were not supported. 

Conclusion: Group-based vs. Computer-based Stress-management Intervention

To counteract the high expected dropout rates in longitudinal studies, researchers often employ specific strategies. A common approach is to recruit a larger initial sample of participants than is ultimately required, anticipating that a significant portion will leave over time. Additionally, throughout the study, researchers must continuously monitor their sample to ensure it remains representative of the broader population and make necessary adjustments if the group's composition changes due to attrition.

Strategies to Mitigate Attrition

A researcher begins a 10-year study to track the long-term cognitive benefits of a new preschool curriculum, starting with 500 children from diverse socioeconomic backgrounds. By the end of the study, only 250 children remain. The data reveals that most of the children who left the study were from low-income families who had moved frequently. What is the most significant threat this situation poses to the researcher's conclusions?

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