condition mean min max ZT0-3 27.85 27.85 27.85 ZT4-7 31.9 31.9 31.9 ZT8-11 28.75 28.75 28.75 ZT12-15 30.700000000000003 30.700000000000003 30.700000000000003 ZT16-19 13.35 13.35 13.35 ZT20-23 46.75 46.75 46.75