condition mean min max ZT0-3 0.77238 0.77238 0.77238 ZT4-7 0.214995 0.214995 0.214995 ZT8-11 0.23329 0.23329 0.23329 ZT12-15 0.1410945 0.1410945 0.1410945 ZT16-19 1.30968 1.30968 1.30968 ZT20-23 0.835356 0.835356 0.835356