Risk factor characteristics of T2D cases and controls at baseline in NHS and HPFS*.

*Values are means (SD) unless otherwise indicated. BMI = body mass index; PMH = post-menopausal hormone.†Test of differences between cases and controls: χ2 for categorical and T-tests for continuous variables.‡Metabolic equivalent task hours/wk for men in HPFS and hours/wk for women in NHS.* 除非另有说明，所有数值均为均值（标准差(Standard Deviation, SD)）。体重指数(Body Mass Index, BMI)；绝经后激素(post-menopausal hormone, PMH)。† 病例组与对照组的差异检验：分类变量采用χ²检验(Chi-squared test, χ²)，连续变量采用t检验。‡ 代谢当量(Metabolic Equivalent Task, MET)小时/周：健康专业人员随访研究(Health Professionals Follow-up Study, HPFS)中的男性人群以该单位统计，护士健康研究(Nurses' Health Study, NHS)中的女性人群同样以小时/周为统计单位。