BRANDS reviving the “Made in the U.S.A.” slogan to attract buyers for American-produced goods are relying less on patriotism and more on data that shows consumers are willing to pay a premium for better quality, quicker availability and product safety.

But many companies are stepping gingerly, avoiding sweeping claims and spelling out what “Made in the U.S.A.” means for their products. Consumers are more shrewd about how few consumer goods actually are made in the United States, leaving companies less wiggle room about the origin of products.

The Whirlpool Corporation, for example, specified in full-page print advertisements this year that 80 percent of its appliances “sold in the U.S. come from our U.S. factories.” Despite its deep American roots, the 101-year-old company — which makes Maytag, Amana, KitchenAid and Jenn-Air products — has, like other corporate giants, moved some manufacturing abroad.

As a result of its centennial celebrations last year, some consumers have urged the company to talk more about its American origins, said William Beck, a senior marketing director at Whirlpool, which spent $57.4 million in 2011 on advertising, according to Kantar Media, a WPP unit.

In recent months, the appliance giant has been underlining its American factories, and noting in its overall brand advertising that it employs about 22,000 workers (15,000 of them at its manufacturing plants), and spends $7.4 billion annually on operating and maintaining its factories in Iowa, Ohio, Oklahoma and Tennessee.

But Whirlpool, whose ad drew a full-page rebuttal from the International Association of Machinists and Aerospace Workers accusing it of shutting factories in the United States, said nostalgia and similar sentiments do not drive its sales. “Whirlpool’s key differentiating points are quality and innovation,” said Mr. Beck, and “the icing is that, hey, we’re made in the United States.”

Whirlpool does not share its market research, but other market studies show that customers increasingly take note of where a product is made. Perception Research Services International, in a September study, found that four out of five shoppers notice a “Made in the U.S.A.” label on packaging, and 76 percent of them said they would be more likely to buy a product because of the label.

While shoppers, especially those over 35, say they want to help the economy by buying United States-made goods, “the motivating factors actually may be quality and safety,” said Jonathan Asher, executive vice president of Perception Research Services. The company, which is based in Teaneck, N.J., surveyed 1,400 consumers last summer. “People are paying attention in categories that are ingested like food, medicine and personal care products, but less so in electronics, office supplies and appliances,” he said.

In a separate study, the Boston Consulting Group found that 80 percent of consumers surveyed said they would be willing to pay more for “Made in the U.S.A.” products than for those carrying a “Made in China” label.

They would pay the biggest differential for items like baby food and wooden toys, and a smaller percentage for electronics, apparel and appliances, said Kate Manfred, director of the group’s Center for Consumer and Customer Insight in the Americas, which released the study in mid-November.

“Safety and quality, and keeping jobs in America, are the important factors,” she said.

Bixbi, a Boulder, Colo., pet treat provider, has relied on safety to increase sales. The company, which started in 2008 amid revelations of tainted dog food ingredients imported from overseas, sells dog treats made from locally raised chickens and other animals.

“Our sales have grown 600 percent each year,” said James Crouch, who founded the small company with his brother, Michael. “Locally sourced is a key advantage.”

But for all the talk about American-made goods, Bixbi is one of the few clients that have adopted “Made in the U.S.A.” marketing, said Dave Schiff, co-founder of Made Movement, a Boulder advertising firm that handles the Bixbi account.