condition mean min max ZT0-3 19.6997 19.6997 19.6997 ZT4-7 13.65895 13.65895 13.65895 ZT8-11 12.6653 12.6653 12.6653 ZT12-15 18.871699999999997 18.871699999999997 18.871699999999997 ZT16-19 22.5539 22.5539 22.5539 ZT20-23 20.959 20.959 20.959