condition mean min max ZT0-3 87.56105 87.56105 87.56105 ZT4-7 144.1955 144.1955 144.1955 ZT8-11 53.454750000000004 53.454750000000004 53.454750000000004 ZT12-15 29.506 29.506 29.506 ZT16-19 24.633499999999998 24.633499999999998 24.633499999999998 ZT20-23 45.44685 45.44685 45.44685