condition mean min max ZT0-3 1.6250575 1.576055 1.6740599999999999 ZT4-7 1.34679 1.34679 1.34679 ZT8-11 1.1027985 1.1027985 1.1027985 ZT12-15 0 0 0 ZT16-19 1.239695 1.239695 1.239695 ZT20-23 1.791145 1.791145 1.791145