condition mean min max ZT0-3 11.534849999999999 11.534849999999999 11.534849999999999 ZT4-7 3.989335 3.989335 3.989335 ZT8-11 6.52015 6.52015 6.52015 ZT12-15 9.16082 9.16082 9.16082 ZT16-19 14.94295 14.94295 14.94295 ZT20-23 16.2823 16.2823 16.2823