condition mean min max ZT0-3 4.2321825 3.659995 4.8043700000000005 ZT4-7 6.010385 6.010385 6.010385 ZT8-11 3.3509849999999997 3.3509849999999997 3.3509849999999997 ZT12-15 0 0 0 ZT16-19 4.90356 4.90356 4.90356 ZT20-23 6.007630000000001 6.007630000000001 6.007630000000001