condition mean min max ZT0-3 9.506155 9.218545 9.793765 ZT4-7 15.155249999999999 15.155249999999999 15.155249999999999 ZT8-11 14.15645 14.15645 14.15645 ZT12-15 0 0 0 ZT16-19 16.6733 16.6733 16.6733 ZT20-23 12.5564 12.5564 12.5564