condition mean min max ZT0-3 40.727494 40.727494 40.727494 ZT4-7 93.06581750000001 93.06581750000001 93.06581750000001 ZT8-11 108.1767475 108.1767475 108.1767475 ZT12-15 63.259859500000005 63.259859500000005 63.259859500000005 ZT16-19 74.779998 74.779998 74.779998 ZT20-23 63.1656335 63.1656335 63.1656335