condition mean min max ZT0-3 13.913988 13.913988 13.913988 ZT4-7 16.177954999999997 16.177954999999997 16.177954999999997 ZT8-11 15.312989 15.312989 15.312989 ZT12-15 14.538884 14.538884 14.538884 ZT16-19 15.854105 15.854105 15.854105 ZT20-23 16.1385495 16.1385495 16.1385495