In a moment, I'll provide some commentary on each of our business units. Again, thank you to our 15-plus-thousand team Schein members around the world who are producing outstanding results for our shareholders quarter-upon-quarter. But before I go into further details and provide commentary, let me ask Steve Paladino, our CFO, to provide commentary on the first quarter financial results.
Okay, thank you, Stan, and good morning to everyone. I am also very pleased to be reporting strong financial results for the first quarter of 2012. Before we begin, I'd like to point out that our 2012 first quarter results include restructuring costs of $11.8 million pretax or $0.09 per diluted share. We announced this restructuring on our last quarterly conference call and Exhibit B to this morning's earnings news release reconciles our GAAP to non-GAAP earnings and EPS from continuing operations.
Turning to our financial performance. Our net sales for the quarter ended March 31, 2012 were $2.1 billion, reflecting a 7.8% increase compared with the first quarter of 2011. This consists of 8.4% growth in local currencies and a 0.6% decline related to foreign currency exchange. In local currencies, our internally generated sales were up 7.8% and the acquisition growth was 0.6%. You can see the details of our sales growth that are contained also in Exhibit A in our earnings news release.
Let me point out that the comparison to the prior year first quarter was favorably impacted because the first quarter of 2012 did not include the December holiday week, whereas that particular holiday week was included in the first quarter of 2011. So this made for a somewhat easier sales growth comparison in the first quarter of 2012. If we adjust for that sales growth for that impact, our worldwide internally generated sales growth for the first quarter was 5.6% in local currencies, and that compares to the 7.8% I just mentioned. This impact was favorable on a worldwide consolidated basis on all of our sales categories, except for Dental equipment. This is because the last calendar week of the year is an exceptionally strong week for Dental equipment sales. This strong week was included in Q1 of last year in our reported sales, but again not in Q1 of the current year. And practitioners often make equipment purchases during the last calendar week of the year to take advantage of various tax incentives as well as other factors. This impact was primarily exhibited in our North American Dental equipment sales, and I will provide the specifics of this impact later on. We also believe that sales were somewhat favorably impacted by the overall mild winter weather this year. This factor had a positive impact in our Dental and Animal Health businesses due to increased patient traffic. However, we believe medical sales were adversely impacted by this mild weather as we saw a decline in sales of certain diagnostic consumable products for the quarter and I'll also talk about this impact later on.
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