condition mean min max ZT0-3 12.523399999999999 12.523399999999999 12.523399999999999 ZT4-7 7.196305000000001 7.196305000000001 7.196305000000001 ZT8-11 11.97615 11.97615 11.97615 ZT12-15 12.5979 12.5979 12.5979 ZT16-19 27.6348 27.6348 27.6348 ZT20-23 17.44765 17.44765 17.44765