condition mean min max ZT0-3 3.2216475 2.76447 3.678825 ZT4-7 5.53785 5.53785 5.53785 ZT8-11 2.126435 2.126435 2.126435 ZT12-15 0 0 0 ZT16-19 2.299595 2.299595 2.299595 ZT20-23 5.465535 5.465535 5.465535