condition mean min max ZT0-3 3.065525 2.76155 3.3695 ZT4-7 4.830830000000001 4.830830000000001 4.830830000000001 ZT8-11 9.439445000000001 9.439445000000001 9.439445000000001 ZT12-15 0 0 0 ZT16-19 6.2694849999999995 6.2694849999999995 6.2694849999999995 ZT20-23 4.81235 4.81235 4.81235