condition mean min max ZT0-3 21.316850000000002 21.316850000000002 21.316850000000002 ZT4-7 25.8666 25.8666 25.8666 ZT8-11 21.6845 21.6845 21.6845 ZT12-15 19.05105 19.05105 19.05105 ZT16-19 17.70015 17.70015 17.70015 ZT20-23 15.42895 15.42895 15.42895