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The table below comes from an article byZuoet al., 2019. Please identify the categorical variables shown in the table? Table I. Characteristics of the Study

The table below comes from an article byZuoet al., 2019. Please identify the categorical variables shown in the table?
Table I. Characteristics of the Study Participants. Variables n (%) Mean (SD) Age, years 61.1 (10.2) Male, n (%) 4,040 (48. 1) Education levels No formal education or illiterate 2,471 (29.4) Some primary school 1,448 (17.3) Finished primary school 1,901 (22.6) Middle school or above 2,576 (30.7) Smoking status Nonsmokers 5,044 (61. 1 ) Former smokers 816 (9.9) Current smokers 2,402 (29.1) Body mass index, kg/m2 24.2 (4.2)

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