condition mean min max ZT0-3 293.466718 293.466718 293.466718 ZT4-7 205.7441225 205.7441225 205.7441225 ZT8-11 202.082151 202.082151 202.082151 ZT12-15 206.75383549999998 206.75383549999998 206.75383549999998 ZT16-19 201.539749 201.539749 201.539749 ZT20-23 203.46340500000002 203.46340500000002 203.46340500000002