condition mean min max ZT0-3 391.82675 337.619 446.0345 ZT4-7 272.47450000000003 272.47450000000003 272.47450000000003 ZT8-11 205.412 205.412 205.412 ZT12-15 0 0 0 ZT16-19 289.93449999999996 289.93449999999996 289.93449999999996 ZT20-23 260.8785 260.8785 260.8785