condition mean min max ZT0-3 28.552750000000003 28.552750000000003 28.552750000000003 ZT4-7 25.3185 25.3185 25.3185 ZT8-11 15.583850000000002 15.583850000000002 15.583850000000002 ZT12-15 27.56315 27.56315 27.56315 ZT16-19 15.240649999999999 15.240649999999999 15.240649999999999 ZT20-23 25.701999999999998 25.701999999999998 25.701999999999998