condition mean min max ZT0-3 1.95713 1.6991 2.21516 ZT4-7 2.9871100000000004 2.9871100000000004 2.9871100000000004 ZT8-11 4.786055 4.786055 4.786055 ZT12-15 0 0 0 ZT16-19 4.018105 4.018105 4.018105 ZT20-23 3.40529 3.40529 3.40529