condition mean min max ZT0-3 40.493449999999996 40.493449999999996 40.493449999999996 ZT4-7 28.049599999999998 28.049599999999998 28.049599999999998 ZT8-11 20.092750000000002 20.092750000000002 20.092750000000002 ZT12-15 19.370449999999998 19.370449999999998 19.370449999999998 ZT16-19 38.70225 38.70225 38.70225 ZT20-23 37.16495 37.16495 37.16495