condition mean min max ZT0-3 70.416975 60.153 80.68095 ZT4-7 33.9178 33.9178 33.9178 ZT8-11 30.850900000000003 30.850900000000003 30.850900000000003 ZT12-15 0 0 0 ZT16-19 56.6648 56.6648 56.6648 ZT20-23 60.260400000000004 60.260400000000004 60.260400000000004