condition mean min max ZT0-3 17.76637 17.76637 17.76637 ZT4-7 17.4802095 17.4802095 17.4802095 ZT8-11 20.428685 20.428685 20.428685 ZT12-15 15.750424 15.750424 15.750424 ZT16-19 15.648944499999999 15.648944499999999 15.648944499999999 ZT20-23 14.5656515 14.5656515 14.5656515