Michael O'Sullivan
Analyst
Good afternoon. Thank you for joining us. I will be presenting the prepared remarks today, along with John Call, our Group Senior Vice President and Chief Financial Officer. Michael Balmuth, our Vice Chairman and CEO, is under the weather and could not be with us this afternoon.
Also on the call are Norman Ferber, Chairman of the Board; Gary Cribb, Executive Vice President, Stores and Loss Prevention; Michael Hartshorn, Senior Vice President and Deputy CFO; and Connie Wong, Director of Investor Relations.
We will begin with a brief review of our first quarter performance, followed by our outlook for the second quarter and fiscal year. Afterwards, we'll be happy to respond to any questions you may have.
As noted in today's press release, we are pleased with the slightly better than expected sales and earnings we delivered in the first quarter, especially considering this growth was achieved on top of strong prior year gains. These results continue to be driven by our ongoing ability to offer terrific bargains to today's value-oriented consumers.
Earnings per share for the 13 weeks ended May 4, 2013, were $1.07, a 15% increase on top of a 26% gain in the prior year. Net earnings for this 2013 first quarter grew 12% to $234.6 million. First quarter sales rose 8% to $2,540,000,000, up from $2,357,000,000 in the first quarter of 2012.
Comparable store sales for the 13 weeks ended May 4, 2013, rose 3% over the 13 weeks ended May 5, 2012. This compared to a robust 9% same-store sales gain for the 13 weeks ended April 28, 2012. The strongest merchandise categories during the quarter were Juniors and Accessories, while the best-performing regions were the Pacific Northwest, the Southwest and California.
Earnings before interest and taxes grew to a record 14.9% of sales, up from 14.4% in the first quarter of 2012. This increased level of profitability was mainly driven by higher merchandise gross margin and also benefited from favorable timing of expenses. John will provide some additional color on these operating margin trends in a few minutes.
As we ended first quarter, total consolidated inventories increased about 8% compared to the prior year, with average in-store inventories down about 3%. Packaway as a percentage of total inventories was even with last year at 45%. Both Ross and dd's DISCOUNTS sales and profits continue to benefit from our ability to flow a larger percentage of fresh merchandise to our stores by operating our business with lower inventory levels. dd's sales and profitability improved in the first quarter as each merchandise offerings also continued to resonate well with their target customers. Our store expansion program remains on track with about 80 locations scheduled to open during 2013, comprised of approximately 60 Ross and 20 dd's DISCOUNTS.
Now John will provide further color on the first quarter results and details on our second quarter guidance.