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Table 1 Baseline characteristics of students

From: The association between tuberculin skin test result and active tuberculosis risk of college students in Beijing, China: a retrospective cohort study

Year Enrollment of freshmen # of follow-up Sex Age (means ± SD) TST positive(%) Strong TST positive(%)
Male(%) Female(%)
2013 14899 14592 45.59 54.41 19.78 ± 1.53 10.85 5.10
2014 20081 19823 51.70 48.30 19.52 ± 1.13 10.60 4.61
2015 18914 18659 58.63 41.37 19.37 ± 0.95 13.53 6.92
2016 14394 14218 59.86 40.14 19.35 ± 1.04 12.74 6.54
Total 68288 67292 54.02 45.98 19.52 ± 1.26 11.92 5.76
  1. TST positive: induration size ≥10 mm or the presence of blister or necrosis
  2. Strong TST positive: induration size ≥15 mm or the presence of blister or necrosis