condition mean min max ZT0-3 8.08037832775 6.546801954 9.613954701499999 ZT4-7 12.591816362500001 12.17858829 13.005044435 ZT8-11 18.9974246875 14.675841255000002 23.31900812 ZT12-15 18.126513145 14.16714035 22.08588594 ZT16-19 12.5147884325 12.2156688 12.813908065 ZT20-23 10.225162911999998 9.828694293999998 10.621631529999998