condition mean min max ZT0-3 0.09115166666666666 0.0 0.17891449999999998 ZT4-7 0.65586 0.65586 0.65586 ZT8-11 12.113600000000002 12.113600000000002 12.113600000000002 ZT12-15 1.683852 1.162889 2.204815 ZT16-19 0.5757245 0.5757245 0.5757245 ZT20-23 0.470195 0.470195 0.470195