condition mean min max ZT0-3 2.2311449999999997 2.00622 2.45607 ZT4-7 3.02198 3.02198 3.02198 ZT8-11 5.802435 5.802435 5.802435 ZT12-15 0 0 0 ZT16-19 5.48804 5.48804 5.48804 ZT20-23 4.178095 4.178095 4.178095