condition mean min max ZT0-3 10.1059951765 7.948042613 12.26394774 ZT4-7 4.065439381 3.6349327565 4.4959460055000005 ZT8-11 3.778868524 3.7167822435 3.8409548045000004 ZT12-15 4.238999805500001 4.098061869 4.379937742 ZT16-19 5.54953513175 4.474168150500001 6.624902112999999 ZT20-23 9.20186021325 8.813470066 9.5902503605