condition mean min max ZT0-3 21.9486 21.9486 21.9486 ZT4-7 21.989800000000002 21.989800000000002 21.989800000000002 ZT8-11 20.35695 20.35695 20.35695 ZT12-15 17.8283 17.8283 17.8283 ZT16-19 21.7107 21.7107 21.7107 ZT20-23 22.7959 22.7959 22.7959