condition mean min max ZT0-3 10.619751 10.619751 10.619751 ZT4-7 12.565498000000002 12.565498000000002 12.565498000000002 ZT8-11 14.0478625 14.0478625 14.0478625 ZT12-15 13.2389735 13.2389735 13.2389735 ZT16-19 9.240981999999999 9.240981999999999 9.240981999999999 ZT20-23 9.724407 9.724407 9.724407