condition mean min max ZT0-3 1.2197921666666667 1.0679555 1.3774 ZT4-7 0.1670865 0.1670865 0.1670865 ZT8-11 0.6773710000000001 0.6773710000000001 0.6773710000000001 ZT12-15 1.1575875 0.56313 1.7520449999999999 ZT16-19 2.09651 2.09651 2.09651 ZT20-23 1.8298299999999998 1.8298299999999998 1.8298299999999998