condition mean min max ZT0-3 30.739273 30.739273 30.739273 ZT4-7 16.553834000000002 16.553834000000002 16.553834000000002 ZT8-11 12.286261499999998 12.286261499999998 12.286261499999998 ZT12-15 14.855575000000002 14.855575000000002 14.855575000000002 ZT16-19 12.9401785 12.9401785 12.9401785 ZT20-23 14.719312500000001 14.719312500000001 14.719312500000001