condition mean min max ZT0-3 22.648600000000002 22.648600000000002 22.648600000000002 ZT4-7 16.7095 16.7095 16.7095 ZT8-11 13.423850000000002 13.423850000000002 13.423850000000002 ZT12-15 13.88655 13.88655 13.88655 ZT16-19 16.17625 16.17625 16.17625 ZT20-23 21.5523 21.5523 21.5523