. 2022 Mar 16;12(3):e050928. doi: 10.1136/bmjopen-2021-050928

Table 3.

Body mass index (BMI) and risks of tuberculosis (TB) in the cohort in Yunnan, 2013–2015

	BMI category, kg/m²
	Underweight	Normal	Overweight or obese
	<18.5	18.5–24.0	≥24.0
Mean (95% CI), kg/m²	17.5 (17.4 to 17.5)	21.4 (21.3 to 21.4)	26.3 (26.2 to 26.3)
Person-years	3464.8	27 382	13 727.7
Number of cases	6	31	6
Incidence rate (per 100 000, 95% CI)	173.2 (63.6 to 376.9)	113.2 (76.9 to 160.7)	43.7 (16.0 to 95.1)
Incidence rate ratio (95% CI)	1.39 (0.53 to 3.65)	Ref	0.35* (0.13 to 0.92)
cHR (95% CI)	1.55 (0.65 to 3.71)	Ref	0.36* (0.15 to 0.87)
Age-adjusted HR (95% CI)*	1.26 (0.52 to 3.03)	Ref	0.34* (0.14 to 0.82)
Multivariable-adjusted HR (95% CI)†	1.26 (0.52 to 3.06)	Ref	0.34* (0.14 to 0.82)
Corrected with DM HR (95% CI)‡	1.25 (0.52 to 3.04)	Ref	0.34* (0.14 to 0.83)

*P<0.01.

*Category with age 65 years.

†Adjusted with covariates: age, sex, ethnicity, marital status, previous treated TB, smoking status, alcohol use, all variables were adjusted as categorical variable.

‡Adjusted with covariates: age, sex, ethnicity, marital status, previously treated TB, smoking status, alcohol use and known diabetes; all variables were adjusted as categorical variables.

cHR, crude HR; DM, diabetes mellitus.