condition mean min max ZT0-3 37.75 37.75 37.75 ZT4-7 14.2 14.2 14.2 ZT8-11 33.3 33.3 33.3 ZT12-15 22.5 22.5 22.5 ZT16-19 22.700000000000003 22.700000000000003 22.700000000000003 ZT20-23 14.049999999999999 14.049999999999999 14.049999999999999