condition mean min max ZT0-3 4.1375825 3.85797 4.4171949999999995 ZT4-7 3.1865449999999997 3.1865449999999997 3.1865449999999997 ZT8-11 1.511835 1.511835 1.511835 ZT12-15 0 0 0 ZT16-19 2.38238 2.38238 2.38238 ZT20-23 3.543015 3.543015 3.543015