condition mean min max ZT0-3 54.57955 47.7142 61.444900000000004 ZT4-7 61.114000000000004 61.114000000000004 61.114000000000004 ZT8-11 67.54429999999999 67.54429999999999 67.54429999999999 ZT12-15 0 0 0 ZT16-19 86.493 86.493 86.493 ZT20-23 91.3989 91.3989 91.3989