condition mean min max ZT0-3 219.98876666666666 114.4958 330.3615 ZT4-7 93.44229999999999 93.44229999999999 93.44229999999999 ZT8-11 94.2303 94.2303 94.2303 ZT12-15 247.676 224.86849999999998 270.4835 ZT16-19 309.99199999999996 309.99199999999996 309.99199999999996 ZT20-23 431.238 431.238 431.238