condition mean min max ZT0-3 54.27965 50.98795 57.571349999999995 ZT4-7 57.278949999999995 57.278949999999995 57.278949999999995 ZT8-11 315.9885 315.9885 315.9885 ZT12-15 0 0 0 ZT16-19 339.88300000000004 339.88300000000004 339.88300000000004 ZT20-23 167.1175 167.1175 167.1175