condition mean min max ZT0-3 9.805869999999999 4.81501 13.450849999999999 ZT4-7 2.9283599999999996 2.9283599999999996 2.9283599999999996 ZT8-11 2.65597 2.65597 2.65597 ZT12-15 9.5268625 8.564675 10.489049999999999 ZT16-19 10.170755 10.170755 10.170755 ZT20-23 12.7155 12.7155 12.7155