condition mean min max ZT0-3 25.89404 25.89404 25.89404 ZT4-7 28.6159765 28.6159765 28.6159765 ZT8-11 23.6329075 23.6329075 23.6329075 ZT12-15 27.282599 27.282599 27.282599 ZT16-19 26.057888 26.057888 26.057888 ZT20-23 23.3574645 23.3574645 23.3574645