condition mean min max ZT0-3 19.153 19.153 19.153 ZT4-7 15.62625 15.62625 15.62625 ZT8-11 13.63155 13.63155 13.63155 ZT12-15 15.1301 15.1301 15.1301 ZT16-19 21.19885 21.19885 21.19885 ZT20-23 19.183500000000002 19.183500000000002 19.183500000000002