Meanings of tracked since in English

The participants had been tracked since they were four years old.

The boat, L'Afalina, had reportedly been tracked since its crew drew attention to it in French Polynesia.

Rainfall has been tracked since 1900 and temperatures since 1910.

As mentioned earlier, USDA figures show a decline in the nutrient content of the forty-three crops it has tracked since the 1950s.

They looked at 1,266 HIV-infected people in the U.S. Air Force who were tracked since the 1980s, as well as 2,000 noninfected people.

For the new study, she and her colleagues used data collected from 178 mothers and their 25-year-old children, who had been tracked since birth.