Susan, I do not think the shading in the print table is significant--I believe it is only for visual tracking purposes. Even-numbered rows are also in italics. I would ignore that as well--it is another visual tracking print device.
NIs are used in the column and row heading numerals but not in the table entries, and with one blank cell between columns, you can fit all 20 columns across two facing braille pages. Your TN can now simply be the first line only. "The table is read across a series of facing pages."