condition mean min max ZT0-3 4.41056 4.41056 4.41056 ZT4-7 3.053845 3.053845 3.053845 ZT8-11 2.42096 2.42096 2.42096 ZT12-15 3.31575 3.31575 3.31575 ZT16-19 5.05863 5.05863 5.05863 ZT20-23 4.560365 4.560365 4.560365