condition mean min max ZT0-3 716.450981 716.450981 716.450981 ZT4-7 276.43111350000004 276.43111350000004 276.43111350000004 ZT8-11 128.061101 128.061101 128.061101 ZT12-15 129.77533549999998 129.77533549999998 129.77533549999998 ZT16-19 124.1435125 124.1435125 124.1435125 ZT20-23 171.3090795 171.3090795 171.3090795