condition mean min max ZT0-3 16.3286 16.3286 16.3286 ZT4-7 12.052 12.052 12.052 ZT8-11 15.770299999999999 15.770299999999999 15.770299999999999 ZT12-15 16.896 16.896 16.896 ZT16-19 18.20935 18.20935 18.20935 ZT20-23 17.89245 17.89245 17.89245