condition mean min max ZT0-3 13.025225 11.0698 14.98065 ZT4-7 12.66845 12.66845 12.66845 ZT8-11 8.15999 8.15999 8.15999 ZT12-15 0 0 0 ZT16-19 9.62529 9.62529 9.62529 ZT20-23 13.6693 13.6693 13.6693