condition mean min max ZT0-3 201.342412 201.342412 201.342412 ZT4-7 185.527463 185.527463 185.527463 ZT8-11 203.644922 203.644922 203.644922 ZT12-15 211.695901 211.695901 211.695901 ZT16-19 207.544969 207.544969 207.544969 ZT20-23 203.97774049999998 203.97774049999998 203.97774049999998