condition mean min max ZT0-3 26.219678175 20.66627646 31.773079889999998 ZT4-7 34.1482443875 31.414616055000003 36.88187272 ZT8-11 24.818190844999997 20.824928704999998 28.811452985 ZT12-15 7.7987180765 6.4554639945000005 9.1419721585 ZT16-19 8.2250765625 6.854387475999999 9.595765649 ZT20-23 9.53365765575 9.2878266445 9.779488666999999