condition mean min max ZT0-3 19.6436792775 17.219507865 22.06785069 ZT4-7 6.147002065000001 5.132205406500001 7.1617987235000005 ZT8-11 0.7067807747499999 0.044475229000000005 1.3690863205 ZT12-15 0.042413675250000005 0.021881521 0.06294582950000001 ZT16-19 0.028490861500000002 0.0148820765 0.042099646500000004 ZT20-23 0.01478942425 0.014459042500000002 0.015119806