condition mean min max ZT0-3 36.642462355 33.46801522 39.81690949 ZT4-7 48.38834007 41.936546125 54.840134015000004 ZT8-11 77.5114206175 65.86596161 89.15687962499999 ZT12-15 32.4889567825 14.354490315 50.62342325 ZT16-19 11.307949561000001 9.235585667 13.380313455 ZT20-23 6.39403236375 4.5896200705000005 8.198444657