condition mean min max ZT0-3 0.3911833333333333 0.0802445 0.936974 ZT4-7 0.8512314999999999 0.8512314999999999 0.8512314999999999 ZT8-11 3.061095 3.061095 3.061095 ZT12-15 2.0893675000000003 1.98751 2.191225 ZT16-19 1.4643595 1.4643595 1.4643595 ZT20-23 1.2151895 1.2151895 1.2151895