condition mean min max ZT0-3 13.522023 13.522023 13.522023 ZT4-7 12.045445 12.045445 12.045445 ZT8-11 15.200814 15.200814 15.200814 ZT12-15 17.703205 17.703205 17.703205 ZT16-19 26.2224745 26.2224745 26.2224745 ZT20-23 18.8439435 18.8439435 18.8439435