condition mean min max ZT0-3 2.0500499999999997 1.851805 2.2482949999999997 ZT4-7 2.671505 2.671505 2.671505 ZT8-11 2.834315 2.834315 2.834315 ZT12-15 0 0 0 ZT16-19 5.81066 5.81066 5.81066 ZT20-23 3.544175 3.544175 3.544175