Methodological considerations in a community-based longitudinal study.

OBJECTIVES

To describe methodological issues and strategies relevant to conducting a community-based longitudinal study.

METHODS

Study participants (N=1117 youth/parent pairs) residing in neighborhoods that were randomly selected using a multistage sampling procedure and 2000 census data. Data were collected annually using in-home, in-person, computer-assisted interviewing methods. Numerous retention methods were used to track and retain participants.

RESULTS

The initial response rate was 61%. The retention rate is 97%, and the valid interview completion rate is 93% after nearly 4 waves of data collection.

CONCLUSIONS

In order for community-based longitudinal studies to overcome barriers to enrollment and retention, particular attention must be given to appropriate planning and available resources.