condition mean min max ZT0-3 45.5 45.5 45.5 ZT4-7 2.2 2.2 2.2 ZT8-11 28.700000000000003 28.700000000000003 28.700000000000003 ZT12-15 27.05 27.05 27.05 ZT16-19 44.35 44.35 44.35 ZT20-23 17.5 17.5 17.5