Is a table used for page layout? If so, does the content read in an understandable, logical order?
Screen readers read through tables in the order in which cells are defined in the HTML code, which can be very different from the order that someone reading visually would follow. It is essential that the reading order match the logical flow of the document so that a screen reader user would hear the document in the same order that a visual reader would read it. The WAT and the WDT have tools that can be used to linearize a page, in order to show reading order.