condition mean min max ZT0-3 580.211042 580.211042 580.211042 ZT4-7 369.58797549999997 369.58797549999997 369.58797549999997 ZT8-11 531.1615919999999 531.1615919999999 531.1615919999999 ZT12-15 655.8540519999999 655.8540519999999 655.8540519999999 ZT16-19 563.2879075000001 563.2879075000001 563.2879075000001 ZT20-23 300.981981 300.981981 300.981981