condition mean min max ZT0-3 14.386126342499999 13.895311775 14.87694091 ZT4-7 11.62313176 11.225903344999999 12.020360175 ZT8-11 13.020374879999999 10.928093335 15.112656424999999 ZT12-15 10.66351960875 9.855324044 11.4717151735 ZT16-19 7.11056464975 6.970536715 7.2505925845 ZT20-23 6.458836660999999 5.488160467999999 7.429512854