condition mean min max ZT0-3 53.060575 41.6355 64.48565 ZT4-7 7.597485000000001 7.597485000000001 7.597485000000001 ZT8-11 5.25928 5.25928 5.25928 ZT12-15 0 0 0 ZT16-19 31.475699999999996 31.475699999999996 31.475699999999996 ZT20-23 42.118449999999996 42.118449999999996 42.118449999999996