condition mean min max ZT0-3 4.3649925 3.065605 5.6643799999999995 ZT4-7 5.360455 5.360455 5.360455 ZT8-11 7.317245 7.317245 7.317245 ZT12-15 0 0 0 ZT16-19 7.91492 7.91492 7.91492 ZT20-23 6.05852 6.05852 6.05852