condition mean min max ZT0-3 0.5320195 0.5320195 0.5320195 ZT4-7 0.46370750000000005 0.46370750000000005 0.46370750000000005 ZT8-11 1.0729484999999999 1.0729484999999999 1.0729484999999999 ZT12-15 0.6598115 0.6598115 0.6598115 ZT16-19 1.125592 1.125592 1.125592 ZT20-23 0.31711999999999996 0.31711999999999996 0.31711999999999996