In one longitudinal study an entire county's population was followed from age 8 to 48.

They are longitudinal studies that follow the same groups of people throughout their lives.

However, longitudinal studies are both expensive and difficult to do.

In Phase 2's longitudinal study, more than 5,000 students will be followed through four years of college.

This was a longitudinal study that followed a group of 3,000, 70-year old citizens over five years.

A longitudinal study done in 2011 focused on these two behaviors.

As a panel survey it is a form of longitudinal study.

The longitudinal study is an attempt to respond to this problem.

She used a massive longitudinal study to research these outcomes.

What can we learn about resilience from large scale longitudinal studies?