condition mean min max ZT0-3 27.39125 25.1296 29.652900000000002 ZT4-7 15.73655 15.73655 15.73655 ZT8-11 22.486150000000002 22.486150000000002 22.486150000000002 ZT12-15 0 0 0 ZT16-19 25.479300000000002 25.479300000000002 25.479300000000002 ZT20-23 29.57615 29.57615 29.57615