condition mean min max ZT0-3 13.099232 13.099232 13.099232 ZT4-7 14.954616999999999 14.954616999999999 14.954616999999999 ZT8-11 13.268179 13.268179 13.268179 ZT12-15 14.605629 14.605629 14.605629 ZT16-19 13.0156365 13.0156365 13.0156365 ZT20-23 13.743814 13.743814 13.743814