condition mean min max ZT0-3 294.423572 294.423572 294.423572 ZT4-7 307.62648 307.62648 307.62648 ZT8-11 324.191434 324.191434 324.191434 ZT12-15 314.354094 314.354094 314.354094 ZT16-19 372.7334885 372.7334885 372.7334885 ZT20-23 351.652749 351.652749 351.652749