condition mean min max ZT0-3 13.18945 13.18945 13.18945 ZT4-7 11.55501 11.55501 11.55501 ZT8-11 9.798575 9.798575 9.798575 ZT12-15 9.782530000000001 9.782530000000001 9.782530000000001 ZT16-19 15.23685 15.23685 15.23685 ZT20-23 15.650749999999999 15.650749999999999 15.650749999999999