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Missing income data that constituted >10% in any given year were imputed using multiple imputation methods. In addition to these variables, all http://www.selleckchem.com/products/Cyclopamine.html adjusted analyses controlled for demographic variables (age, sex, region) and a measure of health care use (the number of physician office visits). Estimates of FOBT in the past year and endoscopy in the past 10 years were age-adjusted to the year 2000 standard, and linear contrasts were used to test for significant differences over time between 2000 and 2008 for subgroups of the SES and race and ethnicity variables. Adjusted prevalences (predicted marginals) were calculated using multiple logistic regression analyses, which controlled for the variables listed above. Differences in trends over time between subgroups of the SES variables were tested using interaction terms between year of survey and SES variable and linear contrasts of the adjusted prevalences. SAS-callable-SUDAAN (SAS Institute Inc., Cary, NC) was used to calculate weighted estimates and standard errors that take into account the complex survey design of the NHIS. In all 3 years, the majority of our analytic sample had private or military insurance, had a usual source of care, was non-Hispanic white, had a high school education or more years http://www.selleck.cn/products/gsk126.html of education, was not poor, and was born in the United States (Table 1). Between 2000 and 2008, the proportion with private and military coverage declined, whereas public coverage http://www.selleckchem.com/products/BI-2536.html increased; and the proportion of those with a high school degree or less than a high school degree declined, whereas those with some college or with a college degree or more increased. There was a decline in the proportion of non-Hispanic whites and the proportion of those born in the United States but an increase in the proportion living in the West and those living in the United States for ��10 years. From 2000 to 2008, there was a significant decline of 5.9% points in the rate of FOBT screening in our study population (95% confidence interval, 4.5%-7.3%; P