condition mean min max ZT0-3 26.159266666666667 14.53355 35.789500000000004 ZT4-7 13.9697 13.9697 13.9697 ZT8-11 16.589100000000002 16.589100000000002 16.589100000000002 ZT12-15 38.461650000000006 36.7186 40.2047 ZT16-19 40.89815 40.89815 40.89815 ZT20-23 45.725449999999995 45.725449999999995 45.725449999999995