Table 3.

Adjusted odds ratio (AOR) for having a larger reaction size and a positive tuberculin skin test (TST)

Feature	Ordinal logistic regression* AOR‡ (95%CI)	Binary logistic regression† AOR‡ (95%CI)
BCG vaccination
No BCG	Ref	Ref
One BCG scar	1.9 (1.1–2.4)§	2.2 (0.8–5.7)
Two BCG scars	3.5 (1.9–4.3)¶	4.8 (1.9–12.5)#
≥3 BCG scars	4.9 (2.1–6.2)¶	7.8 (2.4–25.4)#
Age
Six years of age	Ref	Ref
Effect of each additional year of age	1.1 (1.06–1.13)¶	1.2 (1.1–1.3)¶
Education (≥18 years)**
<10 years (incomplete secondary school or less)	Ref	Ref
≥10 years (secondary school or more)	0.8 (0.4–1.6)	0.5 (0.2–1.2)
History of living with a patient with active tuberculosis
No	Ref	Ref
Yes	2.0 (1.2–3.3)#	3.8 (2.0–7.6)¶
Presence of another TST-positive person in the household
No	Ref	Ref
Yes	1.4 (1.0–2.0)§	2.7 (1.6–4.8)#

^*TST reaction size was categorized as 0, 1–4, 5–9 10–14 and 15 mm.

^†TST reactivity was defined as positive (≥10 mm) and negative (<10).

^‡AORs are adjusted by all other variables except ‘education’ for all participants.

^§P < 0.05.

^¶P < 0.001.

^#P < 0.01.

^**Variable ‘education’ was adjusted for all other variables for participants aged more than 18 years.

Ref = reference group.