condition mean min max ZT0-3 935.36827 935.36827 935.36827 ZT4-7 706.880292 706.880292 706.880292 ZT8-11 779.5953549999999 779.5953549999999 779.5953549999999 ZT12-15 786.4668815 786.4668815 786.4668815 ZT16-19 629.7294565 629.7294565 629.7294565 ZT20-23 602.249512 602.249512 602.249512