condition mean min max ZT0-3 18.9723 15.56865 22.37595 ZT4-7 11.507295 11.507295 11.507295 ZT8-11 10.78585 10.78585 10.78585 ZT12-15 0 0 0 ZT16-19 15.59812 15.59812 15.59812 ZT20-23 11.6142 11.6142 11.6142