Table 5– Characteristics of 254 contacts of pulmonary tuberculosis patients in relation to starting latent tuberculosis infection treatment at the Public Health Service in Amsterdam (the Netherlands) from 2008 to 2011

Factor	Treatment	No treatment	Crude OR	Adjusted OR
All	142 (56)	112 (44)
Index factors
Sex
Males	89 (54)	75 (46)	1	1
Females	53 (59)	37 (41)	1.1 (0.5–2.1)	1.1 (0.5–2.6)
Age
0–14 years	1 (33)	2 (67)	0.8 (0.3–1.8)	0.1 (0.1–0.7)
15–34 years	98 (62)	59 (38)	3.3 (1.3–8.4)	1.8 (0.5–6.0)
35–54 years	30 (50)	30 (50)	1.7 (0.6–4.6)	1.0 (0.2–3.8)
≥55 years	13 (38)	21 (62)	1	1
Country of birth
The Netherlands	43 (57)	33 (43)	1
Outside the Netherlands	99 (56)	79 (44)	1.0 (0.5–2.0)
At risk^#
No	135 (56)	107 (44)	1
Yes	7 (58)	5 (42)	0.8 (0.2–3.6)
Sputum smear status
Positive	139 (57)	106 (43)	1
Negative	3 (33)	6 (67)	0.3 (0.8–1.5)
Contact factors
Sex
Male	89 (56)	69 (44)	1	1
Female	53 (55)	43 (45)	0.8 (0.5–1.4)	0.8 (0.5–1.4)
Age
0–4 years	8 (100)	0
5–14 years	16 (76)	5 (24)	10.5 (2.6–41.5)^¶	8.5 (2.1–34.6)^¶
15–34 years	57 (65)	31 (35)	4.1 (1.3–12.7)	4.0 (1.3–12.4)
35–54 years	48 (52)	45 (48)	2.4 (1.0–5.8)	2.3 (0.8–5.9)
≥55 years	13 (29)	31 (71)	1	1
Nationality
Dutch	98 (64)	55 (36)	1.7 (0.8–3.6)	2.6 (1.2–5.4)
Other	40 (51)	38 (49)	1	1
Unknown	4 (17)	19 (83)	0.2 (0.1–0.5)	0.4 (0.1–1.1)
Type of contact
First circle	99 (63)	59 (37)	10.6 (1.7–63.2)	10.5 (1.5–70.7)
Second circle	39 (49)	40 (51)	5.3 (0.8–34.7)	5.3 (0.7–37.1)
Third circle	2 (18)	9 (82)	1	1
Unknown	2 (33)	4 (67)	2.8 (0.4–16.7)	1.5 (0.2–11.8)
BCG
No evidence of vaccination/unknown	89 (58)	65 (42)	1
Evidence of vaccination	53 (53)	47 (47)	0.7 (0.4–1.3)

Data are presented as n (%) or OR (95% CI). BCG: bacille Calmette–Guérin. ^#: the homeless and drug users; ^¶: age categories 0–4 and 5–14 years were combined to calculate the odds ratio.