The study followed more than 2,500 students from 10 to 14 over two years.

These studies followed 1,100 family members for an average of more than a year each.

The study follows the students through their first four years in the program.

Jobs teaching physical education and social studies followed in District 4.

The study followed the health of its participants over five years.

The study followed the participants for 6.5 years on average.

The study followed 900,000 men and women from 1982, when all were healthy, to 1998.

My study followed 53 students who started at the college in 1989.

A large study followed children born between 22 and 25 weeks until the age of 6 years old.

All told, these studies have followed more than 55,000 people for 5 to 20 years or so.