condition mean min max ZT0-3 1087.087342 1087.087342 1087.087342 ZT4-7 1625.493518 1625.493518 1625.493518 ZT8-11 1734.4821244999998 1734.4821244999998 1734.4821244999998 ZT12-15 1196.119032 1196.119032 1196.119032 ZT16-19 1359.855347 1359.855347 1359.855347 ZT20-23 1012.539749 1012.539749 1012.539749