condition mean min max ZT0-3 16.0908 13.590399999999999 19.73055 ZT4-7 11.626249999999999 11.626249999999999 11.626249999999999 ZT8-11 13.92885 13.92885 13.92885 ZT12-15 21.038175 16.39305 25.6833 ZT16-19 19.38195 19.38195 19.38195 ZT20-23 19.34585 19.34585 19.34585