condition mean min max ZT0-3 44.984645 44.984645 44.984645 ZT4-7 24.976387000000003 24.976387000000003 24.976387000000003 ZT8-11 45.3374525 45.3374525 45.3374525 ZT12-15 80.59718699999999 80.59718699999999 80.59718699999999 ZT16-19 165.102281 165.102281 165.102281 ZT20-23 273.8836415 273.8836415 273.8836415