condition mean min max ZT0-3 22.750775 22.18815 23.3134 ZT4-7 23.898200000000003 23.898200000000003 23.898200000000003 ZT8-11 21.4049 21.4049 21.4049 ZT12-15 0 0 0 ZT16-19 21.7566 21.7566 21.7566 ZT20-23 23.68705 23.68705 23.68705