condition mean min max ZT0-3 31.853905323333333 30.362315326666668 33.34549532 ZT4-7 24.04477986 23.12432743 24.96523229 ZT8-11 16.696753856666668 14.611590343333335 18.781917370000002 ZT12-15 12.9797992565 10.572200853 15.38739766 ZT16-19 9.689609589833335 9.1781333 10.201085879666667 ZT20-23 15.375767999999999 12.47021075 18.28132525