condition mean min max ZT0-3 12.346174999999999 12.3098 12.38255 ZT4-7 10.727150000000002 10.727150000000002 10.727150000000002 ZT8-11 8.707305 8.707305 8.707305 ZT12-15 0 0 0 ZT16-19 16.6789 16.6789 16.6789 ZT20-23 16.49855 16.49855 16.49855