condition mean min max ZT0-3 8.27989 8.27989 8.27989 ZT4-7 10.005398 10.005398 10.005398 ZT8-11 10.898464 10.898464 10.898464 ZT12-15 9.637205999999999 9.637205999999999 9.637205999999999 ZT16-19 10.3396 10.3396 10.3396 ZT20-23 10.039172 10.039172 10.039172