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Items isn’t probably all that useful, but it’s the number of “category groups” that contributed to the word count. So for example, on most sites a category group is something like “Published Posts” and “Unpublished Pages”.
If you scroll down to your “Monthly Statistics” table below the graphs and find the line for January, then look across at the six categories, two of them will be non-zero totals.
Post/Page count would probably make more sense, I’ll look into changing it.
Fixed, new version published.