condition mean min max ZT0-3 3.861688333333333 2.63299 4.8706949999999996 ZT4-7 1.523455 1.523455 1.523455 ZT8-11 2.313355 2.313355 2.313355 ZT12-15 2.02996 2.022705 2.037215 ZT16-19 2.001445 2.001445 2.001445 ZT20-23 3.846975 3.846975 3.846975