condition mean min max ZT0-3 23.824399999999997 23.824399999999997 23.824399999999997 ZT4-7 17.0126 17.0126 17.0126 ZT8-11 15.6494 15.6494 15.6494 ZT12-15 18.2013 18.2013 18.2013 ZT16-19 26.13925 26.13925 26.13925 ZT20-23 22.30205 22.30205 22.30205