condition mean min max ZT0-3 1.9121845 1.513674 2.310695 ZT4-7 1.1348645 1.1348645 1.1348645 ZT8-11 1.340285 1.340285 1.340285 ZT12-15 0 0 0 ZT16-19 0.6564515 0.6564515 0.6564515 ZT20-23 1.571965 1.571965 1.571965