condition mean min max ZT0-3 427.580063 427.580063 427.580063 ZT4-7 455.2585865 455.2585865 455.2585865 ZT8-11 435.03974900000003 435.03974900000003 435.03974900000003 ZT12-15 462.37980300000004 462.37980300000004 462.37980300000004 ZT16-19 427.22222 427.22222 427.22222 ZT20-23 369.920506 369.920506 369.920506