condition mean min max ZT0-3 1.335962677 0.811024858 1.860900496 ZT4-7 4.22431415275 3.7155313784999997 4.733096927 ZT8-11 5.13993812425 4.6519241220000005 5.6279521265 ZT12-15 9.75051583675 8.078484396 11.4225472775 ZT16-19 9.28539583575 9.101872202 9.468919469500001 ZT20-23 10.4595191925 10.017846704 10.901191681