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All other factors are the same: such as, this page is not new, or recently revised, etc.
Thus it appears that Google is considering on-page factors while calculating PR. Makes sense, considering this is meant to be a "relevancy dispay" for users.
Anyone else can confirm/explain this?
Things to consider:
1) PageRank is not a measure of relevancy. It is a measure of link popularity.
2) The toolbar PR is only approximate and should not be relied on totally.
3) It is not always correct to assume that all subpages should have the same PR value. All links (internal and external) to and from all pages need to be taken into consideration.
3) If all linking to, from and within your site has remained constant then what you are seeing could still be explained by a drop of PR for all pages (because pages that link to your site have dropped in PR). The toolbar only displays absolute values so for instance 1 page may have real PR values of 6.0 and the other 6.9 and display 6 for both. You can see what a 10% drop in PR would do to each.