condition mean min max ZT0-3 0.41158533333333336 0.35607500000000003 0.44042800000000004 ZT4-7 0.3345915 0.3345915 0.3345915 ZT8-11 0.690397 0.690397 0.690397 ZT12-15 0.58028725 0.455314 0.7052605 ZT16-19 0.4924115 0.4924115 0.4924115 ZT20-23 0.1885175 0.1885175 0.1885175