condition mean min max ZT0-3 15.0714 15.0714 15.0714 ZT4-7 11.7559 11.7559 11.7559 ZT8-11 12.38795 12.38795 12.38795 ZT12-15 12.42275 12.42275 12.42275 ZT16-19 18.8338 18.8338 18.8338 ZT20-23 16.77335 16.77335 16.77335