condition mean min max ZT0-3 84.500132 84.500132 84.500132 ZT4-7 82.0111595 82.0111595 82.0111595 ZT8-11 67.5105745 67.5105745 67.5105745 ZT12-15 103.373753 103.373753 103.373753 ZT16-19 52.050385999999996 52.050385999999996 52.050385999999996 ZT20-23 36.522985500000004 36.522985500000004 36.522985500000004