WASHINGTON — No matter what information regulators reveal on the stress tests of the largest banks — and what they will say is a mystery — the results are likely to renew calls to nationalize some institutions, and could further complicate efforts to stabilize the industry.

Since the stress tests were first announced two months ago, the industry has become increasingly anxious about what will be made public when they are completed at the end of this month. Regulators have sent mixed signals on the issue, and options range from declaring the results confidential to detailing which institutions need capital and how much.

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