condition mean min max ZT0-3 4.3625975 3.91678 4.808415 ZT4-7 4.917465 4.917465 4.917465 ZT8-11 10.74 10.74 10.74 ZT12-15 0 0 0 ZT16-19 7.2201450000000005 7.2201450000000005 7.2201450000000005 ZT20-23 10.634665 10.634665 10.634665