condition mean min max ZT0-3 425.865176 425.865176 425.865176 ZT4-7 403.3766945 403.3766945 403.3766945 ZT8-11 393.902697 393.902697 393.902697 ZT12-15 371.74656749999997 371.74656749999997 371.74656749999997 ZT16-19 500.9984445 500.9984445 500.9984445 ZT20-23 617.385982 617.385982 617.385982