condition mean min max ZT0-3 365.954047 365.954047 365.954047 ZT4-7 401.9205065 401.9205065 401.9205065 ZT8-11 437.57973200000004 437.57973200000004 437.57973200000004 ZT12-15 477.52846850000003 477.52846850000003 477.52846850000003 ZT16-19 474.909464 474.909464 474.909464 ZT20-23 541.0199375 541.0199375 541.0199375