condition mean min max ZT0-3 24.853470256666665 19.32005175333333 30.386888759999998 ZT4-7 37.69993236833333 26.559137113333332 48.84072762333333 ZT8-11 53.663465009999996 49.06670277 58.26022725 ZT12-15 72.02076677166667 62.78173944 81.25979410333333 ZT16-19 76.37477032000001 71.69133686 81.05820378 ZT20-23 68.76216844999999 67.35190136 70.17243554