condition mean min max ZT0-3 28.075544 28.075544 28.075544 ZT4-7 28.931977500000002 28.931977500000002 28.931977500000002 ZT8-11 40.477366 40.477366 40.477366 ZT12-15 37.481742499999996 37.481742499999996 37.481742499999996 ZT16-19 49.190324000000004 49.190324000000004 49.190324000000004 ZT20-23 45.4114555 45.4114555 45.4114555