condition mean min max ZT0-3 191.1588889 191.1588889 191.1588889 ZT4-7 314.66611109999997 314.66611109999997 314.66611109999997 ZT8-11 200.7227778 200.7227778 200.7227778 ZT12-15 79.69777779 79.69777779 79.69777779 ZT16-19 40.13222222 40.13222222 40.13222222 ZT20-23 74.63111111 74.63111111 74.63111111