condition mean min max ZT0-3 2801.312993 2801.312993 2801.312993 ZT4-7 2401.8073625 2401.8073625 2401.8073625 ZT8-11 1859.9535015000001 1859.9535015000001 1859.9535015000001 ZT12-15 2034.71742 2034.71742 2034.71742 ZT16-19 1969.8813355 1969.8813355 1969.8813355 ZT20-23 2252.591817 2252.591817 2252.591817