condition mean min max ZT0-3 4.314590000000001 4.259365000000001 4.369815 ZT4-7 3.62188 3.62188 3.62188 ZT8-11 4.6724250000000005 4.6724250000000005 4.6724250000000005 ZT12-15 0 0 0 ZT16-19 4.501585 4.501585 4.501585 ZT20-23 3.11721 3.11721 3.11721