condition mean min max ZT0-3 2122.150244 2122.150244 2122.150244 ZT4-7 2278.8797575 2278.8797575 2278.8797575 ZT8-11 2149.2593985000003 2149.2593985000003 2149.2593985000003 ZT12-15 2164.58267 2164.58267 2164.58267 ZT16-19 1968.866833 1968.866833 1968.866833 ZT20-23 1799.3549145 1799.3549145 1799.3549145