condition mean min max ZT0-3 15.646033333333333 11.84835 18.8144 ZT4-7 10.5093 10.5093 10.5093 ZT8-11 6.7930600000000005 6.7930600000000005 6.7930600000000005 ZT12-15 10.181642499999999 9.907835 10.455449999999999 ZT16-19 10.1126 10.1126 10.1126 ZT20-23 15.470849999999999 15.470849999999999 15.470849999999999