condition mean min max ZT0-3 15.01015 14.63345 15.386849999999999 ZT4-7 10.84185 10.84185 10.84185 ZT8-11 12.520199999999999 12.520199999999999 12.520199999999999 ZT12-15 0 0 0 ZT16-19 16.393900000000002 16.393900000000002 16.393900000000002 ZT20-23 13.0647 13.0647 13.0647