condition mean min max ZT0-3 0.9168075 0.7270075 1.1066075 ZT4-7 2.11802 2.11802 2.11802 ZT8-11 1.548555 1.548555 1.548555 ZT12-15 0 0 0 ZT16-19 1.5665365 1.5665365 1.5665365 ZT20-23 2.058835 2.058835 2.058835