condition mean min max ZT0-3 9.95873 9.594619999999999 10.32284 ZT4-7 9.762139999999999 9.762139999999999 9.762139999999999 ZT8-11 9.37865 9.37865 9.37865 ZT12-15 0 0 0 ZT16-19 16.508850000000002 16.508850000000002 16.508850000000002 ZT20-23 16.55005 16.55005 16.55005