condition mean min max ZT0-3 0.33703683333333334 0.097861 0.4814655 ZT4-7 0.22928575 0.22928575 0.22928575 ZT8-11 0.328225 0.328225 0.328225 ZT12-15 1.6228175 1.573 1.672635 ZT16-19 0.7542215000000001 0.7542215000000001 0.7542215000000001 ZT20-23 0.7540955 0.7540955 0.7540955