condition mean min max ZT0-3 5.334838333333333 3.02086 8.191365 ZT4-7 12.527999999999999 12.527999999999999 12.527999999999999 ZT8-11 8.193495 8.193495 8.193495 ZT12-15 17.850775 15.351849999999999 20.3497 ZT16-19 13.44435 13.44435 13.44435 ZT20-23 10.81005 10.81005 10.81005