condition mean min max ZT0-3 31.436531844999998 26.96470889 35.9083548 ZT4-7 37.2507688125 33.96109586 40.540441765 ZT8-11 58.27871942749999 49.20619154 67.351247315 ZT12-15 49.5088414525 40.32200795 58.695674955 ZT16-19 35.4907100775 35.1670592 35.814360955 ZT20-23 43.028164305000004 39.030375 47.02595361