condition mean min max ZT0-3 2.61875 2.61875 2.61875 ZT4-7 1.7117705 1.7117705 1.7117705 ZT8-11 4.13717 4.13717 4.13717 ZT12-15 2.232965 2.232965 2.232965 ZT16-19 1.0246330000000001 1.0246330000000001 1.0246330000000001 ZT20-23 0.7267643333333333 0.7267643333333333 0.7267643333333333