condition mean min max ZT0-3 577.325648 577.325648 577.325648 ZT4-7 1161.9111745 1161.9111745 1161.9111745 ZT8-11 1260.639368 1260.639368 1260.639368 ZT12-15 1141.3152650000002 1141.3152650000002 1141.3152650000002 ZT16-19 821.6125875 821.6125875 821.6125875 ZT20-23 662.6448829999999 662.6448829999999 662.6448829999999