condition mean min max ZT0-3 1.1459350000000001 0.978655 1.313215 ZT4-7 0.6979015 0.6979015 0.6979015 ZT8-11 0.8392605 0.8392605 0.8392605 ZT12-15 0 0 0 ZT16-19 3.64512 3.64512 3.64512 ZT20-23 1.3123049999999998 1.3123049999999998 1.3123049999999998