condition mean min max ZT0-3 1.607975 1.607975 1.607975 ZT4-7 1.533495 1.533495 1.533495 ZT8-11 1.91439 1.91439 1.91439 ZT12-15 1.9427999999999999 1.9427999999999999 1.9427999999999999 ZT16-19 2.634095 2.634095 2.634095 ZT20-23 1.4963549999999999 1.4963549999999999 1.4963549999999999