condition mean min max ZT0-3 110.193484 110.193484 110.193484 ZT4-7 71.49796599999999 71.49796599999999 71.49796599999999 ZT8-11 64.17930050000001 64.17930050000001 64.17930050000001 ZT12-15 75.6082655 75.6082655 75.6082655 ZT16-19 96.7004795 96.7004795 96.7004795 ZT20-23 111.784512 111.784512 111.784512