condition mean min max ZT0-3 10.962222222333335 10.962222222333335 10.962222222333335 ZT4-7 14.57888889 14.57888889 14.57888889 ZT8-11 12.09777778 12.09777778 12.09777778 ZT12-15 9.881111109999999 9.881111109999999 9.881111109999999 ZT16-19 8.63888889 8.63888889 8.63888889 ZT20-23 11.978888889 11.978888889 11.978888889