condition mean min max ZT0-3 12.637889442 7.725535729 17.550243155 ZT4-7 14.89275185625 14.117539319999999 15.6679643925 ZT8-11 22.430199022500002 17.3972751 27.463122945000002 ZT12-15 43.016626175 37.53539507 48.49785728 ZT16-19 36.018598139999995 35.29059272 36.74660356 ZT20-23 39.001733207499996 38.158778875 39.844687539999995