condition mean min max ZT0-3 19.510876 19.510876 19.510876 ZT4-7 24.086512499999998 24.086512499999998 24.086512499999998 ZT8-11 21.973729 21.973729 21.973729 ZT12-15 23.290008 23.290008 23.290008 ZT16-19 21.772212 21.772212 21.772212 ZT20-23 20.300462500000002 20.300462500000002 20.300462500000002