condition mean min max ZT0-3 13.303450000000002 12.65995 13.946950000000001 ZT4-7 10.60721 10.60721 10.60721 ZT8-11 9.680679999999999 9.680679999999999 9.680679999999999 ZT12-15 0 0 0 ZT16-19 12.290949999999999 12.290949999999999 12.290949999999999 ZT20-23 19.4739 19.4739 19.4739