condition mean min max ZT0-3 19.77505 16.2898 23.2603 ZT4-7 9.02902 9.02902 9.02902 ZT8-11 10.454525 10.454525 10.454525 ZT12-15 0 0 0 ZT16-19 15.09305 15.09305 15.09305 ZT20-23 9.440825 9.440825 9.440825