condition mean min max ZT0-3 20.0886 20.0886 20.0886 ZT4-7 12.0833 12.0833 12.0833 ZT8-11 12.479 12.479 12.479 ZT12-15 14.35675 14.35675 14.35675 ZT16-19 17.10915 17.10915 17.10915 ZT20-23 16.64815 16.64815 16.64815