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These also have a gutter to help keep things dry if used for dry storage

J Chromatogr B 769, 177183 (2002)

Bivariate analysis was conducted to examine differences between the intentional and non-intentional groups: the chi-squared test was used for categorical variables, and the independent t-test was used for continuous TPB constructs

METHODS We analyzed 49,703 individuals with a smoking history from the Southern Community Cohort Study (SCCS) and 22,126 individuals with a smoking history from the Black Women's Health Study (BWHS) to assess eligibility for screening under the USPSTF guideline versus a proposed guideline that replaces the 20-pack-year criterion with a 20-year smoking duration criterion