condition mean min max ZT0-3 22.700000000000003 22.700000000000003 22.700000000000003 ZT4-7 4.2 4.2 4.2 ZT8-11 46.35 46.35 46.35 ZT12-15 21.55 21.55 21.55 ZT16-19 35.5 35.5 35.5 ZT20-23 37.400000000000006 37.400000000000006 37.400000000000006