condition mean min max ZT0-3 0.666425 0.44051850000000004 0.8923315 ZT4-7 2.008065 2.008065 2.008065 ZT8-11 0.6745765 0.6745765 0.6745765 ZT12-15 0 0 0 ZT16-19 1.096723 1.096723 1.096723 ZT20-23 0.8802969999999999 0.8802969999999999 0.8802969999999999