condition mean min max ZT0-3 21.492427 21.492427 21.492427 ZT4-7 12.10408 12.10408 12.10408 ZT8-11 10.959661 10.959661 10.959661 ZT12-15 10.4303095 10.4303095 10.4303095 ZT16-19 9.394079000000001 9.394079000000001 9.394079000000001 ZT20-23 11.4045635 11.4045635 11.4045635