condition mean min max ZT0-3 1.431475 1.33539 1.52756 ZT4-7 1.11457 1.11457 1.11457 ZT8-11 1.3303645 1.3303645 1.3303645 ZT12-15 0 0 0 ZT16-19 3.577655 3.577655 3.577655 ZT20-23 2.256955 2.256955 2.256955