condition mean min max ZT0-3 0.47765575000000005 0.3218325 0.633479 ZT4-7 0.20661449999999998 0.20661449999999998 0.20661449999999998 ZT8-11 1.0903665 1.0903665 1.0903665 ZT12-15 0 0 0 ZT16-19 0.978271 0.978271 0.978271 ZT20-23 0.664014 0.664014 0.664014