condition mean min max ZT0-3 16.300975 13.1175 19.484450000000002 ZT4-7 54.3688 54.3688 54.3688 ZT8-11 78.132 78.132 78.132 ZT12-15 0 0 0 ZT16-19 46.9964 46.9964 46.9964 ZT20-23 34.47855 34.47855 34.47855