Table 2 The incidence and risk of tuberculosis by BMI category.

From: Association of underweight status with the risk of tuberculosis: a nationwide population-based cohort study

BMI category (kg/m2)

Number at risk

TB events

Person-years

Incidence rate (per 1000 person-year)

Estimated hazard ratio (95% confidence interval)

Non-adjusted

Model 1*

Model 2†

Model 3‡

< 18.5

429,604

4549

2,657,961.15

1.71

1.77 (1.72, 1.83)

2.01 (2.02, 2.15)

2.05 (1.98, 2.11)

2.08 (2.02, 2.15)

18.50–22.9

4,400,081

26,710

27,637,461.41

0.97

Reference

Reference

Reference

Reference

23.00–24.9

2,746,863

10,976

17,321,680.31

0.63

0.66 (0.64, 0.67)

0.57 (0.56, 0.58)

0.57 (0.56, 0.59)

0.56 (0.55, 0.58)

≥ 25.0

3,558,784

10,380

22,446,051.46

0.46

0.48 (0.47, 0.49)

0.41 (0.40, 0.42)

0.42 (0.41, 0.42)

0.40 (0.39, 0.41)

p for trend

    

< 0.001

< 0.001

< 0.001

< 0.001

  1. BMI body mass index.
  2. *Adjusted for age and sex.
  3. †Adjusted for variables in model 1, smoking, alcohol consumption, regular exercise and low-income status.
  4. ‡Adjusted for variables in model 2, hypertension, diabetes mellitus and dyslipidemia.
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