Table 4. Bivariable and multiple logistic regression analyses of predictors for having low TB knowledge^a among HIV-infected TB patients.

Characteristics	OR	95% CI	p	AOR	95% CI	p
Age	1.0	1.0–1.0	0.96	1.0	1.0–1.0	0.92
Male	1.1	0.8–1.6	0.57	1.2	0.8–1.9	0.33
Treated at national infectious diseases referral hospitalb	5.1	3.0–8.7	<0.01	3.0	1.6–5.8	<0.01
Treated at Ubon Ratchathanib	1.5	0.9–2.7	0.13	0.8	0.4–1.5	0.44
Treated at Phuketb	2.4	1.3–4.0	0.01	1.6	0.8–3.4	0.20
Severe TB disease§	2.4	1.7–3.4	<0.01	1.7	1.1–2.5	0.02
CD4<200 cells/µL at baseline	2.1	1.3–3.5	<0.01	1.7	0.9–3.1	0.10
Hospitalized at enrollment	2.6	1.8–3.7	<0.01	1.7	1.1–2.6	0.02
Know anyone with TB	0.8	0.5–1.1	0.13	0.8	0.5–1.3	0.38
Low HIV knowledge	2.3	1.6–3.3	<0.01	2.2	1.5–3.3	<0.01
Delay in TB diagnosisc	0.8	0.5–1.1	0.14	0.8	0.6–1.3	0.41
Registered as new case	1.9	1.1–3.3	0.03	1.2	0.6–2.3	0.57
Answered negatively on question if someone in your family received treatment for TB, you would share the same bed with them	1.4	1.0–2.0	0.06	1.2	0.8–1.8	0.36

TB, tuberculosis; HIV, human immunodeficiency virus; OR, odds ratio; AOR, adjusted odds ratio; CI, confidence interval; CD4, CD4+ T-lymphocyte; variables for which p≤0.20 in bivariable analyses and potential confounders were included in multiple logistic regression analysis.

^aTB knowledge score<5; TB knowledge score is a summary score of the number of TB knowledge questions (see table 2 - each question is worth 1 point) that a patient correctly answered.

^bCompared with being treated in Bangkok.

^cPatients who had extra-pulmonary TB other than peripheral lymphatic TB or had all of the following characteristics: self-reported weight loss >10% of body weight, coughing up blood, difficulty breathing in past 4 weeks before TB diagnosis, and cavitary TB or >1/3 involvement of either lung at the initial evaluation.