condition mean min max ZT0-3 12.8779 12.74895 13.06515 ZT4-7 14.13925 14.13925 14.13925 ZT8-11 16.38775 16.38775 16.38775 ZT12-15 21.31515 20.484099999999998 22.1462 ZT16-19 17.91245 17.91245 17.91245 ZT20-23 15.16425 15.16425 15.16425