condition mean min max ZT0-3 3.34457020375 2.814922153 3.8742182544999997 ZT4-7 2.9649696765 2.8679686540000002 3.0619706989999997 ZT8-11 3.92468067025 3.1551020045 4.694259336 ZT12-15 7.68644551175 4.896897666999999 10.4759933565 ZT16-19 8.020846702250001 7.105494119499999 8.936199285 ZT20-23 11.73243608 11.225307265 12.239564895