Characteristics of breast cancer cases and controls, stratified by ethnicity, 4-Corners Breast Cancer Study, 1999–2004.

Abbreviations: SD, standard deviation; MET, metabolic equivalent of activity; gm, grams; kcal, kilocalories.aCase-control comparison within ethnicity using the Chi-square test for categorical variables and the t test for continuous variables.bEthnic group comparison, regardless of case-control status, using the Chi-square test for categorical variables and the t test for continuous variables.cEducation level. Missing data for 1 case and 1 control for non-Hispanic White women; 4 cases and 2 controls for Hispanics.dFirst degree of family history. Missing data for 20 cases and 24 controls for non-Hispanic White women; 14 cases and 19 controls for Hispanics.eCigarette smoking status. Missing data for 1 case and 4 controls for non-Hispanic White women; 2 controls for Hispanics.fOral contraceptive use within five years prior to referent year.gMenopausal status. Missing data for 3 cases for non-Hispanic White women; 2 cases and 3 controls for Hispanics.hStage of tumor. Missing data for 34 for non-Hispanic White women; 12 for Hispanics.iModerate/vigorous physical activity at referent year.