condition mean min max ZT0-3 3.41415 3.189195 3.639105 ZT4-7 2.36408 2.36408 2.36408 ZT8-11 4.402875 4.402875 4.402875 ZT12-15 0 0 0 ZT16-19 10.826065 10.826065 10.826065 ZT20-23 6.215805 6.215805 6.215805