condition mean min max ZT0-3 6.1320625 5.752829999999999 6.5112950000000005 ZT4-7 3.45059 3.45059 3.45059 ZT8-11 4.89529 4.89529 4.89529 ZT12-15 0 0 0 ZT16-19 14.4269 14.4269 14.4269 ZT20-23 1.989715 1.989715 1.989715