condition mean min max ZT0-3 413.56398579999995 404.6275641 422.5004075 ZT4-7 107.7662448925 87.06189782 128.470591965 ZT8-11 130.03206012 94.39842884 165.66569140000001 ZT12-15 229.919658825 207.23589725000002 252.6034204 ZT16-19 328.82673015 327.29488319999996 330.3585771 ZT20-23 343.03943675 335.276276 350.8025975