condition mean min max ZT0-3 38.218675 36.502849999999995 39.9345 ZT4-7 95.59885 95.59885 95.59885 ZT8-11 2.25001 2.25001 2.25001 ZT12-15 0 0 0 ZT16-19 66.6982 66.6982 66.6982 ZT20-23 102.24549999999999 102.24549999999999 102.24549999999999