Credit card delinquencies fell to their lowest point in 17 years in the second quarter as consumers remained cautious about taking on more debt and issuers continued their conservative approach to lending, TransUnion Corp. said Tuesday.

The national rate of credit-card borrowers who were 90 or more days late on paying their bills was 0.6% in the quarter, down from 0.74% in the first quarter and 0.92% a year earlier, the credit bureau said.

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