condition mean min max ZT0-3 265.59191455 231.77745339999998 299.4063757 ZT4-7 259.540702725 232.77602155 286.30538390000004 ZT8-11 352.8215878 312.89203054999996 392.75114505 ZT12-15 483.250498475 482.9172086 483.58378834999996 ZT16-19 427.69304155 383.51651089999996 471.8695722 ZT20-23 283.900221775 250.69704869999998 317.10339485000003