condition mean min max ZT0-3 18.936095 18.936095 18.936095 ZT4-7 23.368565500000003 23.368565500000003 23.368565500000003 ZT8-11 19.879203 19.879203 19.879203 ZT12-15 21.444754500000002 21.444754500000002 21.444754500000002 ZT16-19 21.9138125 21.9138125 21.9138125 ZT20-23 22.1344295 22.1344295 22.1344295