condition mean min max ZT0-3 3.5952900000000003 3.41954 3.77104 ZT4-7 5.627685 5.627685 5.627685 ZT8-11 5.855945 5.855945 5.855945 ZT12-15 0 0 0 ZT16-19 5.0607050000000005 5.0607050000000005 5.0607050000000005 ZT20-23 4.612065 4.612065 4.612065