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

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