(Bloomberg) – Lumber Liquidators Holdings Inc. flooring, tested for formaldehyde, was found to have a three times higher risk of causing cancer than previously stated, U.S. regulators said in reversing their own finding from earlier this month.

A report released Feb. 10 used incorrect ceiling heights, lowering by about three times the airborne concentration that should have been examined and reducing the danger, the U.S. Centers for Disease Control and Prevention said in a statement on its website. The estimated risk of tumors is six cases to 30 cases per 100,000 people, the CDC said, above the two to nine cases in the earlier report.

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