condition mean min max ZT0-3 2.04003 2.04003 2.04003 ZT4-7 0.840614 0.840614 0.840614 ZT8-11 0.35376450000000004 0.35376450000000004 0.35376450000000004 ZT12-15 1.553075 1.553075 1.553075 ZT16-19 4.674465 4.674465 4.674465 ZT20-23 3.2731500000000002 3.2731500000000002 3.2731500000000002