condition mean min max ZT0-3 16.459600000000002 16.459600000000002 16.459600000000002 ZT4-7 7.81635 7.81635 7.81635 ZT8-11 12.5528 12.5528 12.5528 ZT12-15 18.03785 18.03785 18.03785 ZT16-19 27.5726 27.5726 27.5726 ZT20-23 24.28705 24.28705 24.28705