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Context:

The breast-feeding rate was lower in subjects with type 2 diabetes compared with the control subjects, at 20 versus 27 percent in African Americans; 50 versus 84 percent for Hispanics; and 39 percent versus 78 percent for non-Hispanic whites, respectively.

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In the context above, I think:

Hispanics = Hispanic-Americans;

non-Hispanic whites = non-Hispanic American whites.

Am I on the right track?
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For the most part, you'll see -Americans with African. African-Americans. It's not used for Hispanics.

I'm not sure I understand this, though. You can't have 20% of African-Americans with Type II as those who were breast fed while only 29% were not. What did the other 51% do? LIkewise, if 39% of the non-Hispanic whites with Type II were breast fed, how can 78% not have been? That's 117%!
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Close, but no cigar.

"The breast-feeding rate was lower in subjects with type 2 diabetes compared with the control subjects, at 20 versus 27 percent in African Americans; 50 versus 84 percent for Hispanics; and 39 percent versus 78 percent for non-Hispanic whites, respectively."
(Experimental) Subjects (i.e., with type 2 diabetes):
African-Americans: 20% breast feeding; 80% not.

Hispanics: 50% breast feeding; 50% not.

non-Hispanic whites: 39% breast feeding; 61% not.
Control (Subjects) (i.e., diabetes status unknown, i.e., randomly selected from the population at large):
African-Americans: 27% breast feeding; 73% not.
Hispanics: 84% breast feeding; 16% not.
non-Hispanic whites: 78% breast feeding; 22% not.
CJ
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Comments  
Let's look at two pools of subjects, non-Hispanic whites in control pool vs non-Hispanic whites in experiment pool, each having 100 subjects for the sake of discussion

After conducting the experiment for a period of time, some subjects have type 2 diabetes while the others do not have.

78% of the non-Hispanic whites in the control pool that have type 2 diabetes were breast fed.

39% of the non-Hispanic whites in the experiment pool that have type 2 diabetes were breast fed.

This is my interpretation and hope I'm right. fingers crossed.
 CalifJim's reply was promoted to an answer.
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I couldn't understand whether the sentence meant 'all the subjects in the experiment had type 2 diabetes' to begin with or a percentage develop the diabetes after completion of the experiment. I chose the latter because if the subjects already had type 2 diabetes at the beginning of the experiment, what's there to experiment with? But at the same time, I felt the experiment would be a long experiment, possibly 30 to 40 years, to run. I guess, I don't understand the experiment setup.
Thank you all for posting.

The entire context is here:

Does Breastfeeding Boost IQ?

Study Shows Breastfed Kids Score Better on Some IQ Tests

May 5, 2008 -- Breastfeeding may make your kid more intelligent, according to the latest study on the subject.

Exclusive, long-term breastfeeding improves a child's verbal intelligence and other intelligence measures, says researcher Michael S. Kramer, MD, professor of pediatrics, epidemiology and biostatistics at the McGill University Faculty of Medicine in Montreal.

The study was published in the May edition of Archives of General Psychiatry.

Children who were breastfed longer scored higher on average at age 6 1/2 years in verbal intelligence, nonverbal intelligence, and overall intelligence, Kramer finds. Teachers rated them higher in reading and writing than children who weren't breastfed as long or as exclusively.

"Prolonged and exclusive breastfeeding makes kids smarter," Kramer tells WebMD. "I would say as a target for mothers, if they could exclusively breastfeed for three months and continue to breastfeed for some degree for one year, that would be good."

Breastfeeding exclusively [with no formula supplements] for six months would be even better, Kramer says. But he concedes that is difficult for many women, especially if they return to work.

Breastfeeding and IQ: Studying the Data
A host of studies have looked at breastfeeding and IQ. "Most of the studies have found an association between breastfeeding and higher IQ," Kramer tells WebMD. But most have been what scientists call observational studies, with children whose mothers chose to breastfeed compared with those children whose mothers chose not to.

Kramer and others say these studies may be affected by differences in the way moms who breastfeed interact with their children and those who don't.

Kramer and his colleagues looked at almost 14,000 children in Belarus who visited 31 hospitals and clinics there. The participants are part of the large-scale study known as the Promotion of Breastfeeding Intervention Trial (PROBIT). The researchers assigned half to an intervention that encouraged them to breastfeed exclusively long term or to another group that got the usual maternity care and child care.

This approach is considered more feasible and ethical than assigning mothers to breastfeed or bottle-feed.

"Those who got the breastfeeding intervention breastfed longer and more exclusively," Kramer says. The number of mothers still breastfeeding exclusively at three months was seven times higher in the intervention group of mothers -- 43% compared to 6% of those who didn't get the intervention.

http://children.webmd.com/news/20080505/does-breastfeeding-boost-iq