condition mean min max ZT0-3 10.259936 10.259936 10.259936 ZT4-7 10.9125895 10.9125895 10.9125895 ZT8-11 11.1923885 11.1923885 11.1923885 ZT12-15 10.595409499999999 10.595409499999999 10.595409499999999 ZT16-19 11.316871500000001 11.316871500000001 11.316871500000001 ZT20-23 8.4948065 8.4948065 8.4948065