condition mean min max ZT0-3 18.698999999999998 18.698999999999998 18.698999999999998 ZT4-7 24.135199999999998 24.135199999999998 24.135199999999998 ZT8-11 12.926749999999998 12.926749999999998 12.926749999999998 ZT12-15 7.319775 7.319775 7.319775 ZT16-19 8.659215 8.659215 8.659215 ZT20-23 13.424150000000001 13.424150000000001 13.424150000000001