condition mean min max ZT0-3 17.71685 17.71685 17.71685 ZT4-7 15.116299999999999 15.116299999999999 15.116299999999999 ZT8-11 13.6684 13.6684 13.6684 ZT12-15 11.4312 11.4312 11.4312 ZT16-19 14.75985 14.75985 14.75985 ZT20-23 16.2905 16.2905 16.2905