condition mean min max ZT0-3 8.948527499999999 7.65825 10.238805 ZT4-7 3.3808949999999998 3.3808949999999998 3.3808949999999998 ZT8-11 4.191725 4.191725 4.191725 ZT12-15 0 0 0 ZT16-19 8.10581 8.10581 8.10581 ZT20-23 8.81444 8.81444 8.81444