condition mean min max ZT0-3 0.008961 0.008961 0.008961 ZT4-7 0.0249434 0.0249434 0.0249434 ZT8-11 0.02706595 0.02706595 0.02706595 ZT12-15 0.01636955 0.01636955 0.01636955 ZT16-19 0.0107865 0.0107865 0.0107865 ZT20-23 0.01081085 0.01081085 0.01081085