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Otherwise any small increase in relative risk could be explained by other variables

Moreover, following World War II, migration patterns among Black Americans leaving the Deep South created concentrated population centers throughout the United States that opened up new marketing advantages for companies with the means to capitalize on them

Adjusted Odds Ratio (Adj OR) for smoking was also calculated using the main food groups triggering abdominal discomfort (meat, dairy, fried, and spicy food categories), age, and BMI as covariates, to eliminate their possible influence on the association between smoking and IBS