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Table 4 Contribution of risk factors for bacteriologically positive TB and active TB

From: Incidence and risk factors of tuberculosis among the elderly population in China: a prospective cohort study

Risk factors

Prevalence among cohort

Bacteriologically positive TB

Active TB

HRa

PAF (%)

HRa

PAF (%)

Male

0.467

1.470

18.0

1.784

26.8

Age(≥ 75)

0.366

1.498

15.4

1.332

10.8

Other nationality

0.132

-

-

5.152

35.4

Previously treated with TB

0.017

-

-

3.175

3.6

Ex/current smoking

0.197

2.119

18.1

1.484

8.7

BMI < 18.5

0.105

2.328

12.2

1.285

2.9

  1. -: Not applicable; TB Tuberculosis, PAF Population attributable fraction, HR Hazard ratio, BMI Body mass index;