condition mean min max ZT0-3 2.78031 2.78031 2.78031 ZT4-7 2.430645 2.430645 2.430645 ZT8-11 1.8189899999999999 1.8189899999999999 1.8189899999999999 ZT12-15 2.0635000000000003 2.0635000000000003 2.0635000000000003 ZT16-19 2.4278500000000003 2.4278500000000003 2.4278500000000003 ZT20-23 2.7633850000000004 2.7633850000000004 2.7633850000000004