condition mean min max ZT0-3 2.06861 2.06861 2.06861 ZT4-7 1.25927 1.25927 1.25927 ZT8-11 1.0660560000000001 1.0660560000000001 1.0660560000000001 ZT12-15 1.8071199999999998 1.8071199999999998 1.8071199999999998 ZT16-19 2.4153200000000004 2.4153200000000004 2.4153200000000004 ZT20-23 1.3856950000000001 1.3856950000000001 1.3856950000000001