condition mean min max ZT0-3 1.5871631666666666 0.41852449999999997 2.221765 ZT4-7 0.8620950000000001 0.8620950000000001 0.8620950000000001 ZT8-11 0.494548 0.494548 0.494548 ZT12-15 0.9186895000000002 0.617414 1.2199650000000002 ZT16-19 1.3130950000000001 1.3130950000000001 1.3130950000000001 ZT20-23 2.7432350000000003 2.7432350000000003 2.7432350000000003