The most common purpose is to present numerical data. Other data may be in the form of words, phrases or sentences. Perhaps one could be cut out.
Columns are better than rows for comparisons.
Some short tables may not, but major tables should have captions. It should usually be short, leaving extended discussion to the text. Editing statistical tables Instead of repeating an entire paper in this newsletter, I have placed it on the Web site. Top Floor Publishing, 1999. It's all very well having a Web site, but if no one visits, it's a bit of a waste of time and money.