Table 3 Multivariate logistic regression for factors associated with delayed isolation of patients with pulmonary TB during hospitalization.

Variables	Total		Model 1		Model 2		Model 3
Variables	OR (95% CI)	p*	OR (95% CI)	p	OR (95% CI)	p	OR (95% CI)	p
Demographic
Age	1.04 (1.01–1.07)	0.01	1.04 (1.01–1.08)	0.002	1.04 (1.01–1.06)	0.01	1.04 (1.01–1.08)	0.01
Comorbidity
Malignancy	4.75 (1.30–17.39)	0.02			5.95 (1.54–23.03)	0.01	4.86 (1.37–17.19)	0.01
Clinical features
Other pain			4.11 (1.27–13.25)	0.02	3.97 (1.26–12.51)	0.02
Microbiological findings
AFB smear					0.31 (0.12–0.83)	0.02
Hospitalization course
Admission department	4.03 (1.52–10.74)	0.005	3.51 (1.39–8.85)	0.008			7.09 (2.34–21.46)	0.001
Radiological findings (chest radiograph)
Activity	0.22 (0.08–0.66)	0.01	0.23 (0.08–0.64)	0.005	0.19 (0.07–0.57)	0.003	0.18 (0.06–0.52)	0.002

^*All variables from Table 1 with P < 0.05 were included in the first step of multivariate analyses. Only significant variables in the final multivariate logistic regression model after backward selection are presented.
Model 1: Without comorbidity.
Model 2: Without hospitalization course.
Model 3: Without microbiological results.
Abbreviations: CI, confidence interval; SD, standard deviation; COPD, chronic obstructive pulmonary disease; HIV, human immunodeficiency virus; TB, tuberculosis; AFB, acid-fast bacilli; PCR, polymerase chain reaction.

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