To make these list you must have competed in the event during both the 2016 & 2017 indoor track season. Also, so we don't have an infinite list you must have made the top 500 times in NC for returners in 2016 and a top 500 mark in the 2017 season. We have sorted the marks by who had the biggest difference between the two years. A negative value means the athletes time from 2016 was faster than the 2017 time and they have not better their season best from a year ago so far this indoor season. Through this feature to compile these list we are not able to include converted times for a Mile to a 1600 or a 2 Mile for a 3200.
