Characteristics of study participants by categories of diabetes, prediabetes and reference category (neither diabetes nor prediabetes).

Continuous data are expressed as mean ± standard deviation or median with the interquartile range within parenthesis.(m) indicates number of individuals with missing value.p-value for current smokers and ex-smokers, respectively, calculated using never smokers as reference category.

连续性资料以均值±标准差或带有四分位数间距的中位数形式呈现；括号内的(m)代表存在缺失值的个体数量。分别以从不吸烟者作为参照类别，计算当前吸烟者与既往吸烟者的P值。