A new study finds that even a little extra income can make a big difference in helping middle-class people ward off disability//.

"The surprise was at the upper end," said Meredith Minkler, an author of a report on the study in the Aug. 17 issue of the New England Journal of Medicine. "We always knew there was a major gap between the very poor and the very rich. To find that the middle class was at a substantial disadvantage to slightly wealthier folks was a surprise."

The study needed the information to help it prepare for the health needs of 8,000 people per day who were nearing 60. It was sponsored by the U.S. National Institute on Aging (NIA).

Data on 335,000 people 55 and older collected as part of the Census 2000 American Community Survey was used in this study. In that survey, pollsters asked older Americans about the disabilities that affected some of the basic activities such as walking, lifting etc.

Starting with poverty ($8,259 for someone 65 or older living alone in 2000, $17,761 for a family of four) and going up to 700 percent of that figure -- $124,327 or over, the respondents were classified into 9 household income levels.

With increase in age, disability also increased. The incidence of disability was16.2 % in men of age 55 to 64 while it was 47.5% in men 85 and older. Among women aged 55 to 64, the incidence of disability was 17.2 %, whereas, it was 57.9 % for those aged 85 and older.

The difference between making a good income and making a very good income turned out to be significant, the researchers said. For instance, men aged 65 to 74 in the "600-699 percent" income group ($49,544 single-person income) had a 44 percent higher odds of disability than those in the "700 percent" group, where single-person income topped $57,813 per year. For women aged 55 to 64, that income difference translated to a 16 percent increase in incidence of disability.

“There are several possible exp
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