Table 3 Incidence and risk of tuberculosis in the underweight subpopulation 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)

Crude model

Model 1*

Model 2†

Model 3‡

Normal (18.5 ≤ BMI < 23.0)

4,400,081

26,710

27,637,461.41

0.97

Reference

Reference

Reference

Reference

Mild thinness (17.0 ≤ BMI < 18.5)

349,652

3406

2,173,728.20

1.57

1.62 (1.57, 1.68)

2.00 (1.93, 2.07)

1.97 (1.90, 2.04)

1.98 (1.91, 2.05)

Moderate thinness (16.0 ≤ BMI < 17.0)

61,445

786

376,382.18

2.09

2.16 (2.01, 2.32)

2.55 (2.37, 2.74)

2.50 (2.33, 2.69)

2.50 (2.33, 2.68)

Severe thinness (BMI < 16.0)

18,507

357

107,850.76

3.31

3.42 (3.09, 3.80)

2.72 (2.44, 3.02)

2.67 (2.40, 2.97)

2.83 (2.55, 3.15)

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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