Table 1.

Limitations and recommendations for improved participant retention practices

Limitations	Recommendations
Uncoordinated planning efforts	A priori retention protocol planning
Poor funding of retention efforts	Study budgets committed to retention
Heterogeneity in reporting	Standardized reporting
Descriptive/narrative analyses	Quantitative/comparative analyses
Post-hoc analyses of “what worked”	Ongoing evaluation of specific strategies

Adapted with permission from [39]